What is the percent by mass of Ca in CaCl2?
The percent by mass of Ca in CaCl2 is 36 percent
mass of Ca = 40 gram
mass of CaCl2 = 35.5 x 2 = 111 gram
percent by mass of element = molar mass of element/mass of compound x 100
percent mass of Ca = 40/111 = 36 percent
What is mean by percent by mass ?The concentration of an element in a compound or component in a mixture can be expressed, for example, as a mass percentage. The mass of a component is divided by the entire mass of the combination, then multiplied by 100%, to compute the mass percentage. Other Names: mass percent, (w/w)%
With the aid of this formula, one can determine the lowest entire number of moles and the proportional number of atoms of each element present in a compound. The true molecular formula can be calculated by chemists using the empirical formula. The number of atoms in the compound are specified in this formula.Learn more about Percent by mass here:
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03 Question (1 point)
A
pot of water on a stove is heated to a rapid boil. What is the the gas inside the bubbles that form in the boiling water?
1st attempt
Choose one or more:
air
H2(g)
□ O2(g)
OH2O(g)
See par
lid See Periodic Table
The gas inside the bubbles that form in the boiling water is H₂O(g).
The gas inside the bubbles that form in the boiling water is mostly water vapor. The bubbles in the water vapor start to form on nucleation sites. The water vapor bubbles start to form larger as the temperature increases because more liquid is being converted to gaseous form. Vapor-filled bubbles shrink and disappear completely.
Therefore, when water is boiling the physical state of water, liquid changes to another state of water which is gaseous.
Hence, the bubble that we see in boiling water is the gaseous form H₂O(g) of water.
The boiling water is the vaporous form H₂O(g) of boiling water.
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A 2.64 L aqueous solution of KOH. The solution has a density of 1.29 g/mL.
Calculate the molarity, Molality, and mass percent concentration of the solution.
The molarity of the solution is 0.023 M and the molality of the solution is 17.9 m.
What is the molality?The concentration of a solution is defined as the amount of substance in a solution. Now we are told that we have a solution of 2.64 L aqueous solution of KOH. The solution has a density of 1.29 g/mL.
Density of the solution = 1.29 g/mL
Volume of the solution = 2.64 L
mass of the solution = 1.29 g/mL * 2.64 L = 3.4 g
Number of moles of the solute = 3.4 g/56 g/mol = 0.061 moles
Molarity = 0.061 moles/2.64 L = 0.023 M
Molality of the solution = 0.061 moles/3.4 * 10^-3 Kg = 17.9 m
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A new linear temperature scale, degrees Zunzol ( ∘Z ), is based on the freezing point and boiling point of a newly discovered compound zunzol. The freezing point of zunzol, −117.3 ∘C, is defined as 0 ∘Z, and the boiling point of zunzol, 78.4 ∘C, is defined as 100 ∘Z. What is the freezing point of water in degrees Zunzol?
The boiling point of water in Zunzol is 59.9∘Z.
What are fixed points?A thermometer must have two fixed points, the upper fixed points and the lower fixed point. The upper fixed point corresponds to the boiling point while the lower fixed point corresponds to the melting point.
Having that;
x - 0/100 = 0 - (-117.3)/78.4 - (-117.3)
x/100 = 117.3/195.7
195.7x = 117.3 * 100
x = 117.3 * 100/195.7
x = 59.9∘Z
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My water bottle contains 500 grams of water, H2O. How many moles of water is this?
Answer:
18g6.02×1023molecules=500gx. 18 g 6.02 × 10 23 molecules = 500 g x .
Explanation:
An IV is prepared to deliver 2.00 L of a saline solution to a patient with a drop factor of 60.0 gtt/mL and a drip rate of 115.0 gtt/min. How many hours will it take to deliver all of the solution?
2 hour 30 minute it take to deliver all of the solution
Normal saline is a cornerstone of intravenous solutions commonly used in the clinical setting IV saline to replenish lost fluids, flush wounds, deliver medications, and sustain patients through surgery, dialysis, and chemotherapy and saline IV have even found a place outside the hospital, as a trendy hangover remedy
Here given data is IV saline solution deliver = 2.00 L and drop factor = 60.0 gtt/mL and drip rate = 115.0 gtt/min.
We have to calculate hours = ?
So for calculating hours
Time = volume × drip rate
Time = 2.00 L × 115.0 gtt/min
Time = 230 means 2hours 30 minute
2 hours 30 minute will it take to deliver all of the solution
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when liquid water loses energy, a change in state or chemical identity occurs. This is an example of a chemical or physical change?
Answer:
Physical change
Explanation:
Because there may be or may not be change in state,shape size.When water is heated it come to a state of vapour
How many moles of N are in 0.207 g of N₂O?
Number of moles of N in 0.207 g of N₂O= 0.0094
We are starting with 0.207g of N₂O in this instance. Let's use the molar mass, which is 44.013 g/mol, to convert that to moles.
(1 mol N₂O / 44.013 g N₂O) x 0.207 g
⇒ 0.00470 mol N₂O.
Having reached moles of nitrogen monoxide, we must now determine how many moles of nitrogen there are. We can see that there is a subscript of 2, indicating that there are two moles of nitrogen for every mol of nitrogen dioxide. You might think of it in terms of food; there are two pieces of bread for every sandwich.
In order to obtain moles of N, let's multiply the amount of moles of N₂O by 2.
(2 mol N / 1 mol N₂O )x 0.00470 mol N₂O = 0.0094 mol N.
Hence, Number of moles of N in 0.207 g of N₂O will be 0.0094.
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Question 3
A piece of metal with a mass of 15.45 g is added to 21.27 mL of water in a
graduated cylinder. The water level rises to 24.78 mL. The density of the metal
is
g/mL.
Hint: You need to apply the significant figure rule for subtraction first; then apply
the significant figure rule for division. Do not round until the end!
Enter your answer as number without a unit.
The density of the object is 4.4 g/mL.
What is density?The term density refers the ratio of the mass of the mass to the volume of a body. The density of a body is a constant as it does not change irrespective of the mass or the volume of the object in at any given time. We have now been told that the former volume of the water was 21.27 mL. The addition of the object increased the volume of the object to about 24.78 mL.
Let us recall that is common to obtain the volume of a solid by the displacement method. The volume of the substance before and after the addition of the solid is recorded. The volume of the solid is taken to be the volume of the liquid that is displaced since the solid must displace its own volume of liquid.
Hence we have;
Mass = 15.45 g
Volume = 24.78 mL - 21.27 mL = 3.51 mL
Density = 15.45 g/3.51 mL
= 4.4 g/mL
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Forensics:
roshni, a forensic scientist, has ruled out several different drugs when testing a substance found in a car. She suspects that the substance is cocsine, what should roshni do next?
1-Perform a confirmatory test
2-Put the substance in a bag, label it, and send it to a DEA office
3-Confer with a colleague about her suspicions.
4-Collect a blood sample and see if it also contains the same substance
Since she suspects that the substance is cocsine, the thing that she should do next is option 1-Perform a confirmatory test.
How the Evidence Is Collected?The way that Drug evidence is collected is that from any crime scene, evidence is obtained, photographed, packaged, documented as well as been sent for analysis and then the forensic scientist will carry out the Analysis.
Since the evidence has been sent to Roshni, all she has to do is to carry out the confirmatory test to see if the drug is what she suspected.
Therefore, Since she suspects that the substance is cocsine, the thing that she should do next is option 1-Perform a confirmatory test.
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how many mm are equal to 4.75x10^-2 m
Answer:
47.5 millimeters
Explanation:
What chemical reaction takes place when removed from bond( as shown above)?
Answer:
Dehydration synthesis involves the formation of new chemical bonds between two molecules which leads to the formation of new compounds. A reaction occurs with the loss of water molecules at each step.
(ii) An element A is in period 3 and it loses three electrons to form an ion. (a) Write the electronic configuration of atom A. (B) Calculate the number of atoms in element A if it has a mass of 27.0g.[5.022x10^23] (c)What is the name of the ion formed?
The aluminum ion, Al3+, is produced when an aluminum atom loses three electrons, and the magnesium ion, Mg2+, is produced when a magnesium atom loses two electrons. Atoms of elements that lose electrons gain a positive charge.
The three valence electrons in aluminum are lost, forming a cation with a positive charge of three: These cations have names that correspond to the metals that they are made of the octet rule is not always followed by transition elements and the metals to their right; frequently, they create more than one cation. Ionization is the process by which ions are created when an atom or molecule gains or loses an electron.
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Mary studies plants. Which branch of science dose she work in?
Answer:The branch pf science that Mary works in is botany because botany is the study of plants.
Draw the structures of the products of the neutralization reaction between hydroxide ion and acetic acid
Answer:
CH3COOH + OH- ----> CH3COO- + H2O
Can the individual substances in a homogeneous mixture be physically separated from each other?
Answer:
No
Explanation:
They are bonded on a molecular level and a chemical process must be used to separate
Identify the nuclide produced when carbon-14 decays by beta emission: 14 6C→ 0−1e + ?
This nuclear reaction would give Boron - 14 as the product.
What is beta emission?A beta emission has to do with the transformation of a proton to electron. This occurs with the change in the atomic number of the element. In this case, the parent nucleus that undergoes decay is carbon - 14.
The daughters nucleus will have the same mass number but a different atomic number. Let us now see the product of this reaction.
From the equation shown, this nuclear reaction would give Boron - 14 as the product.
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An atom of sodium -23 has a net charge of +1 identify the number of protons, neutrons, and electrons in the atom. Then explain how you determine the number of each type of particle. Use the periodic table to help
The number of each type of particle is:
The number of protons is 11
The number of neutrons is 12
The number of electrons is 10
A proton is a stable subatomic particle with the symbols p, H+, or 1H+ and an electric charge of +1 e. Its mass is 1836 times greater than that of an electron and only slightly less than that of a neutron. Every atom's nucleus contains one or more protons. The defining characteristic of an element is its atomic number, which is the number of protons in its nucleus (represented by the symbol Z).
The neutron, symbol n or n0, is a subatomic particle with a neutral charge and slightly more mass than a proton. Atomic nuclei consist of protons and neutrons. With the exception of the hydrogen nucleus, which has a single proton, neutrons are necessary for the stability of nuclei. Nuclear fission and fusion generate a ton of neutrons.
For a neutral Na, Sodium atom:
The mass number P+N = 23
Atomic number (E or P) = 11
A charged Na atom that has lost an electron is positively charged and so: Number of Protons = 11 (Still the same)
Number of neutrons = 12
Number of electrons = 11-1=10 (the atom has lost an electron)
If an atom loses an electron, it becomes positively charged ie. P>E
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CAN SOMEONE PLEASE HELP ME WITH THIS!!! JUST EXPLAIN TO ME HOW TO GET THE ANSWER BC I ALREADY KNOW IT THATS ALL
1) The mass of the object is 18 g
2) The correct relationship is option C
What is density?Density is the ratio of the mass to the volume of a body. We know that the density of the body is an intrinsic property. This implies that it does not change with the amount of substance or with the mass of the body. Let us now try to solve each of the problems.
1) Density = mass/volume
Volume = 1 cm * 3 m * 2 cm = 6 cm^3
Density of the body = 3 g/cm^3
Mass of the body = 6 cm^3 * 3 g/cm^3 = 18 g
2) To answer question 2, we have to remind ourselves of what we said that the density is the ratio of the mass to the volume of a body and that the density of a body is constant. This implies that the relationship that defines the relationship of the mass to the density of the material does not change and this is shown by option C.
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A canister with fixed volume at 97.2 kPa and 23.0°C is
to a pressure of 1.88 atm. What is the final
in the canister in degrees Celsius?
compressed
temperature
The final temperature of the canister is 312.76 degrees celsius.
The relation between temperature and pressure is given by the Gay Lusaac’s Law.
According to this law at constant volume, pressure is directly proportional to the temperature.
Mathematically it is as follows,
Pressure (P) ∝ Temperature(T)
P = K T
P/T = K(constant)
Thus the ratio of P/T will remain the same if volume remains constant.
So, P1/T1 = P2/T2
Here P1= initial pressure of the canister = 97.2 kPa = 0.95 atm
P2 = Final pressure of the canister = 1.88 atm
T1 = Initial temperature = 23 c = 296 K
T2 = Final temperature = ?
Putting these values
0.95/296 = 1.88/T2
T2 = 585.76 K or 312.6°C.
Thus, the final temperature of the canister is 312.76 degrees celsius.
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a. What are the four states, or phases, of matter? Describe the shape and volume properties of each phase. Can they change, or are they fixed? i. _______________________ Shape: Volume: ii. _______________________ Shape: Volume: iii. _______________________ Shape: Volume: iv. _______________________ Shape: Volume:
The four states or phases of matter are:
LiquidSolidGasPlasmaLiquid: This state or phase of matter has no definite shape. It takes the shape of the container.
Liquid has a fixed volume: The particles of liquid are held close togetherSolid: Solid has a definite volume and shape
This means that matter in the solid state takes the shape of whatever container it is.If it takes the shape of its container, it then means that it also has a fixed volume.Gas: Neither a definite shape nor volume.
This means that gas as a state of matter has no definite shape. It has also no definite volumePlasma: No fixed shape or volume.
They are usually denser than solid or liquids.It has no fixed shape and volume What is matter?Matter can simply be defined as anything that has mass and occupies space. There are four major States or phases of matter. These are: Solid, liquid, gas and plasma.
So therefore, the four states or phases of matter are:
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I need help with this question
Answer:
I think It's the 2nd "There are two compounds present"
How many silver atoms are there in 3.74 g of silver?
Express your answer using three significant figures.
2.01214904 × 10²² silver atoms are there in 3.74 g of silver
The most common isotope of silver has 60 neutrons, 47 protons, and 47 electrons. Silver is a soft metal with a glossy metallic luster under normal circumstances. It is exceedingly malleable and ductile (can be formed into a wire).
The molar mass of silver is as follows:
Molar mass of Ag = 107.8682 g/mol
The number of atoms in a molar mass is Avogadro’s number:
6.022140857 × 10²³
Therefore 3.8 g of silver contains 3.8 times 6.022140857 × 10²³ divided by 107.8682 that equals 0.03522818 times
6.022140857 × 10²³
= 2.01214904 × 10²² atoms.
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The Ksp of mercury(II) hydroxide, Hg(OH)2, is 3.60×10^−26 . Calculate the solubility of this compound in grams per liter.
The solubility of the compound is obtained as 9.5 * 10^-14 M.
What is the solubility product?The solubility product refers to the equilibrium constant that shows the extent to which a thing is soluble in water, Now we can write the solubility product as;
Ksp = [Hg^2+] [2OH^-]^2
Let [Hg^2+] = [OH^-] = x
Then I can write;
Ksp = x * (2x)^2
Ksp = 4x^3
When x = solubility
x = ∛Ksp/4
Ksp = 3.60×10^−26
x = ∛ 3.60×10^−26/4
x = 9.5 * 10^-14 M
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The percent by mass of oxygen in H4P2O7
The percent by mass of oxygen in H₄P₂O₇ is 62.92%.
How to calculate percentage by mass?The percentage by mass of an element in a compound can be calculated by dividing the atomic mass of the element by the molar mass of the compound multiplied by 100 as follows:
% by mass = atomic mass of O/molar mass of H₄P₂O₇ × 100
The molar mass of H₄P₂O₇ can be calculated as follows:
1(4) + 31(2) + 16(7) = 178g/mol
Percent by mass of oxygen = (112g/mol ÷ 178g/mol) × 100
Percent by mass of oxygen = 62.92%
Therefore, 62.92% is the percent by mass of oxygen.
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what is the smallest alkyne
Answer:
Cyclooctyne (C8H12) is the smallest cycloalkyne capable of being isolated and stored as a stable compound
Explanation:
hope this helps
Which of the following contains as many atoms as 18 g of water, H₂O?
a) one mole of nitrogen, N2
b) two moles of nitrogen, N2
c) two moles of sodium chloride, NaCl
d) three miles of zinc, Zn
which stament best explain why the dog is able to see the object more the rabbit can
Answer:
The position of their eyes
Explanation:
See, the dog is able to see the object more than the rabbit can is because of the position of their eyes.
The dogs eyes are positioned in the front like our eyes making the dog have a stereoscopic vision (180 degree field of view)
With rabbits though, they can't really see what's in front of them because their eyes are on the side hence the dog can see the object more than the rabbit can.
In Chemistry we look at the composition and the_____of matter
A Se ion has a mass number of 77 and a charge of −2
. Determine the number of neutrons, protons, and electrons in this ion.
number of neutrons:
number of protons:
number of electrons:
Answer:
neutrons = 71
protons = 6
electrons = 6
Explanation:
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