Mol He in the mixture = 2
Further explanationGiven
50% by mass
2.2 moles of mixture
Required
The mole number of He
Solution
50% by mass⇒ mass of He : mass of Ar = 1 : 1
Mol He = 2.2 - mol Ar
mass He = mass Ar
mol x MW He = mol x MW Ar
(2.2-mol Ar) x 4 = mol Ar x 40
8.8 - 4 mol Ar = 40 mol Ar
8.8 = 44 mol Ar
mol Ar= 0.2
mol He = 2.2 - 0.2 = 2
HELP! ASAP!!! WILL MARK BRAINLIEST!!
Which of the following compounds in the main group is an alkali metal? Question 7 options: Beryllium (Be) Rubidium (Rb) Hydrogen (H) Strontium (Sr)
Answer:
Rb
Alkali Metals are Group 1 so
Rb it isnt Hydrogen because it is a gas
Explanation:
Compare the modern model of an atom to the atomic model proposed by John Dalton in 1805
Answer:
See explanation
Explanation:
Dalton's atomic theory furnished us with a basis to discuss the theory of atoms. However, not all his ideas holds up under the scruitiny of morden science.
He postulated that atoms were 'indivisible' the discovery of subatomic particles indeed show that there are smaller particles than atoms.
His postulation that atoms can neither be created nor destroyed does not hold water today because atoms are being created in nuclear reactors.
He said that atoms of all elements are exactly alike. Today we know there are isotopes of elements which are not exactly alike.
We can see that the Dalton's atomic theory did not take cognisance of the important role of subatomic particles in studying the structure of the atom. Modern atomic theory tries to look at the importance of these particles in the understanding the structure of the atom.
In the product 6O2, what does the coefficient mean?
Answers:
There are 12 molecules of O2,
There are 8 molecules of O2,
There are 6 molecules of O2.
There are 2 molecules of O2.
Answer:
(A) there are 12
Explanation:
bc
Guys please help me this is for a final
What happens when you change only the number of electrons inside of an atom
Answer: Changing the number of electrons will change the overall charge on an atom.
Explanation:
An atom that loses electrons will become positively charged and an atom with added electrons will become negatively charged. ... A charged atom is called an ion.
14. What is the total number of kilojoules of heat needed to change 150. G of
ice to water at 0°C?
Answer:
[tex]\boxed {\boxed {\sf 50.1 \ kJ}}[/tex]
Explanation:
When water changes from ice (solid) to water (liquid), it is melting or fusion. Therefore, we can use the following formula to find energy:
[tex]q=mH_f[/tex]
where q is the energy, m is the mass, and Hf is the heat of fusion.
1. Define Values
The mass is 150 grams. The heat of fusion for water is 334 Joules per gram.
[tex]m= 150 \ g \\H_f=334 \ J/g[/tex]
2. Calculate Energy
Substitute the values into the formula.
[tex]q=150 \ g * 334 \ J/g[/tex]
Multiply. Note that the grams (g) will cancel each other out and leave Joules as our units.
[tex]q=150 *334 \ J[/tex]
[tex]q=50100 \ J[/tex]
3. Convert Units
We found the answer in joules, but the question asks for kilojoules, so we must convert.
There are 1000 Joules in 1 kilojoule. Therefore, we can divide the joules calculated by 1000.
[tex]50100 \ J *\frac{1 \ kJ}{1000 \ J}[/tex]
[tex]\frac{50100 \ kJ}{1000 \ }[/tex]
[tex]50.1 \ kJ[/tex]
50.1 kilojoules are needed to change 150 grams of ice to water.
Determine whether each melting point observation corresponds to a pure sample of a single compound or to an impure sample with multiple compounds.
The question is incomplete, the complete question is;
Determine whether each melting point observation corresponds to a pure sample of a single compound or to an impure sample with multiple compounds.
Experimental melting point is BELOW literature value
Experimental melting point is CLOSE to literature value
WIDE melting point range
NARROW melting point range
Answer:
narrow melting point-pure sample of a single compound
experimental melting point is close to literature value-pure sample of a single compound
wide melting point range-impure sample of multiple compounds
experimental melting point is below literature value-impure sample of multiple compounds
Explanation:
The experimental melting point of a pure single compound is sharp and extremely close to the melting point of the substance as recorded in the literature. Usually, a pure substance melts within a narrow range of temperatures.
Impure samples of multiple compounds melt over a range of temperatures. Also if the experimental melting point is well below the record in literature, then the sample is contaminated by other compounds.
PLZ HELP! THIS IS DUE IN A FEW MINS!
What would happen to work and power if the mass of the person walking was increased or decreased? EXPLAIN.
Answer:
work and power increases or decreases opposite of the mass
Explanation:
This Is beacuse Work is the product of Mass, Gravity, and Height
A reaction involved in the production of iron from iron ore is:
Fe2O3(s)
CO (g)
Fe (s)
CO2
a) How many kilograms of CO must react to produce 3.50 kg of Fe?
b) What mass of CO, would be produced?
Answer:
a) 2.632 kg
b) 41.36 kg
Explanation:
Given data:
Mass of CO react = ?
Mass of Fe formed = 3.50 Kg (3.50 /1000 =3500 g)
Mass of CO₂ formed = ?
Solution:
Chemical equation;
Fe₂O₃ + 3CO → 2Fe + 3CO₂
Number of moles of Fe:
Number of moles = mass/molar mass
Number of moles = 3500 g/55.85 g/mol
Number of moles = 62.67 mol
now we will compare the moles of iron with CO.
Fe : CO
2 : 3
62.67 : 3/2×62.67 = 94 mol
Mass of CO:
Mass = number of moles × molar mass
Mass = 94 mol × 28 g/mol
Mass = 2632 g
In kilogram:
2632g × 1 Kg /1000 g
2.632 kg
Now we will compare the moles of Fe with CO₂
Fe : CO₂
2 : 3
62.67 : 3/2×62.67 = 94 mol
Mass of CO₂:
Mass = number of moles × molar mass
Mass = 94 mol × 44 g/mol
Mass = 4136 g
In kilogram:
4136g × 1 Kg /1000 g
41.36 kg
Which particle has high rate of deposition
Answer:
a particle with jagged rough ends has a high rate of deposition
Answe
Explanation:
1st Remove ( )
2nd select like terms
3rd Move the constant to the left
4th calculate
5th divided both sides
6th use quadratic formula
Which type of reaction is C1pHO11 12C + 11H,0?
O synthesis
O decomposition
O oxidation
O combustion
Answer:
C. oxidation ..........
The given reaction is the breaking of the carbohydrate C₁₂H₂₂O₁₁ into 12 C and 11 H₂O. Hence, it is a decomposition reaction .
What is decomposition reaction ?A decomposition reaction is a type of chemical reaction in which a compound breaks down into two or more simpler substances, either through heat, light, or an electrical current.
In a decomposition reaction, a single reactant is converted into two or more products, which can be elements or compounds.
The general equation for a decomposition reaction can be written as:
AB → A + B
where AB is the reactant and A and B are the products.
Decomposition reactions are important in many chemical processes, such as the breakdown of organic matter in soil, the production of industrial chemicals, and the functioning of biological systems.
The given reaction is the decomposition of C₁₂H₂₂O₁₁ into 12 C and 11 H₂O.
Find more on decomposition reactions:
https://brainly.com/question/16987748
#SPJ7
Your complete question is follows:
C₁₂H₂₂O₁₁ ⇒ 11 H₂O + 12 C
Which type of reaction is
O synthesis
O decomposition
O oxidation
O combustion
What is the resultant pressure if 1.7 mol of ideal gas at 273 K and 2.79 atm in a closed container of constant volume is heated to 315 K? Answer in units of atm.
Answer: The resultant pressure is 3.22 atm
Explanation:
Gay-Lussac's Law: This law states that pressure is directly proportional to the temperature of the gas at constant volume and number of moles.
[tex]P\propto T[/tex] (At constant volume and number of moles)
[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 2.79 atm
[tex]P_2[/tex] = final pressure of gas = ?
[tex]T_1[/tex] = initial temperature of gas = 273K
[tex]T_2[/tex] = final temperature of gas = 315 K
[tex]\frac{2.79}{273}=\frac{P_2}{315}[/tex]
[tex]P_2=3.22atm[/tex]
Thus the resultant pressure is 3.22 atm
What does bananas batteries and people have in common
Water weathers rock and minerals by ___________________ them.
melting
dissolving
burning
ablating
Answer:
Dissolving?
Explanation:
Answer:
B. Dissovling
Explanation:
Im a smart boy G.
hypothesize why carbohydrates are found in plant cell walls
Answer:
Plants can split starch into it's simpler glucose units for use as energy when needed. Cellulose is known as a structural carbohydrate because of the fibers formed by it's molecules. It is the major component of plant cell walls and comprises over half of the carbon found on planets.
Explanation:
I majored in Chemistry
What is the electron configuration of a sulfur atom in the ground state?
Answer:
1s²2s²p⁶3s²p⁴
Explanation:
An atom that is in the ground state has not lost or gained electrons. If we look at the Periodic Table, we can see that the electron configuration of the sulfur atom (S) is [Ne]3s²p⁴. Since the electron configuration of Ne is 1s²2s²p⁶, the complete electron configuration is 1s²2s²p⁶3s²p⁴.
7. What is the name of: CH3-CH(CH3)-CH2- alky group? *
isopropyl
propyl
sec-butyl
butyl
Answer:
propyl
1-propylmethane or 2-methylpropane
What is the formula for the compound formed by a magnesium cation (Mg2+) and a fluoride anion (F- )?
Answer:
MgF₂
Explanation:
Fluorine only has a 1- charge, so to satisfy the 2+ charge on magnesium–– you need 2 fluorine atoms to balance out the charges.
What's the Henry's law formula for gas concentration?
What will most likely happen to the action of an enzyme from the small intestine if it is placed in
an environment similar to the environment in which enzyme C functions best?
Answer:
It would be able to function because the ph of the environment is similar to that of intestine.
Explanation:
The pH of the small intestine is eight. The enzyme would be able to function because enzyme C functions best at a Ph range around 8.
catalyst
A reaction between NH, and O, is the first step in the
preparation of nitric acid (HNO3) on a commercial scale.
The products are produced at 1000°C (1273 K) and at at-
mospheric pressure.
4 NH; (g) + 5 O2 (g) → 4 NO (g) + 6 H2O (1)
a. What volume of NO is produced in the reaction vessel
by the reaction of 0.500 mol O2?
b. What mass of H2O is produced by the reaction of 15.0 L
of NH3?
c. How many liters of O, must react to produce 35.5 L of
NO?
a. volume of NO : 41.785 L
b. mass of H2O : 18 g
c. volume of O2 : 9.52 L
Further explanationGiven
Reaction
4 NH₃ (g) + 5 O2 (g) → 4 NO (g) + 6 H2O (l)
Required
a. volume of NO
b. mass of H2O
c. volume of O2
Solution
Assume reactants at STP(0 C, 1 atm)
Products at 1000 C (1273 K)and 1 atm
a. mol ratio NO : O2 from equation : 4 : 5, so mo NO :
[tex]\tt \dfrac{4}{5}\times 0.5=0.4[/tex]
volume NO at 1273 K and 1 atm
[tex]\tt V=\dfrac{nRT}{P}=\dfrac{0.4\times 0.08206\times 1273}{1}=41.785~L[/tex]
b. 15 L NH3 at STP ( 1mol = 22.4 L)
[tex]\tt \dfrac{15}{22.4}=0.67~mol[/tex]
mol ratio NH3 : H2O from equation : 4 : 6, so mol H2O :
[tex]\tt \dfrac{6}{4}\times 0.67=1[/tex]
mass H2O(MW = 18 g/mol) :
[tex]\tt mass=mol\times MW=1\times 18=18~g[/tex]
c. mol NO at 1273 K and 1 atm :
[tex]\tt n=\dfrac{PV}{RT}=\dfrac{1\times 35.5}{0.08206\times 1273}=0.34[/tex]
mol ratio of NO : O2 = 4 : 5, so mol O2 :
[tex]\tt \dfrac{5}{4}\times 0.34=0.425[/tex]
Volume O2 at STP :
[tex]\tt 0.425\times 22.4=9.52~L[/tex]
If u wanted to measure an irregular object volume which of the following device’s could u see
I JUST NEED HELP!!! ASAP!!1 PLEASE!!!
Which fundamental principle from chemistry states different samples of the same substance contain elements in the same proportions?
Question 15 options:
A)
Law of simple multiple proportions
B)
Plum-pudding model
C)
Law of constant composition
D)
Bohr model
Answer:
I believe its A) Law of simple multiple proportions
Explanation:
The law of definite proportions states that a given chemical compound always contains the same elements in the exact same proportions by mass.
Answer:
A) Law of simple multiple proportions
Explanation:
What is the mass of 3.02 x 1025 formula units of barium nitrate?
Answer:
10000 g BaNO₃
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
3.02 × 10²⁵ formulas units BaNO₃
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of Ba - 137.33 g/mol
Molar Mass of N - 14.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of BaNO₃ - 137.33 + 14.01 + 3(16.00) = 199.34 g/mol
Step 3: Convert
[tex]3.02 \cdot 10^{25} \ formula \ units \ BaNO_3(\frac{1 \ mol \ BaNO_3}{6.022 \cdot 10^{23} \ formula \ units \ BaNO_3} )(\frac{199.34 \ g \ BaNO_3}{1 \ mol \ BaNO_3} )[/tex] = 9996.79 g BaNO₃
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
9996.79 g BaNO₃ ≈ 10000 g BaNO₃
Don't help me
Ima fine.k!!!!!!!!
Answer:
ok!
Explanation:
What actions can you take to reduce your impact on science?
Answer:
Don't travel by air if you can avoid it because air travel uses up large amounts of fossil fuels and creates greenhouse gases. Dispose of any rubbish responsibly - it can be hazardous to wildlife. Use public transport, cycle or walk instead of using a car. Use facilities and trips run by local people whenever possible.
Answer:
Practicing recycling and green computing
Please Help Me Balance The equation!! will mark brainliest
Answer: XCl2(aq) + 2 AgNO3(aq) ---> X(NO3)2(aq) + 2 AgCl(s)
Explanation:
Hehe I remembered how...
____________________________ the cell organelle where cellular respiration occurs.
Answer:
Mitochondrion is the cell organelle where cellular respiration occurs.
Hope it helps ^^
Answer:
Mitochondria
I hope this helps!
Question 8 of 10
What will happen when a reactant is added to a system at equilibrium?
A. The system will remain at equilibrium.
B. Only the concentration of that reactant will change.
C. More reactants will form.
D. The equilibrium of the system will be upset.
SUBMIT
the equilibrium of the system will be upset
Explanation:
Help please I’ll give you brain list
Answer:
A
Explanation:
SHOW WORK
The iPhone X is 5.65 inches long. What is the length in cm?
Answer:
14.351
Explanation: