Answers
Explanation:
Given parameters:
Density of the ethanol = 0.789g/mL
Volume of the ethanol in the cylinder = 900mL
Unknown:
Mass of the ethanol = ?
Solution:
Since density is the mass per unit volume of a substance;
mass = density x volume
Now insert the parameters and solve;
mass = 0.789g/mL x 900mL
mass = 710g
In scientific notation we have 7.10 x 10²g
Related Questions
Which of the following is true for an element that is oxidized during a redox reaction?
Group of answer choices
It gains electrons.
It gains protons.
It loses protons.
It loses electrons.
Answers
Answer:
It loses electrons.
Explanation:
When an atom is oxidized in a redox reaction, it simply loses electrons and the oxidation number increases.
An oxidized atom implies that oxidation has occurred; oxidation can be defined as:
addition of oxygen to a specieremoval of hydrogen from a specie loss of electron by an atomincrease in the oxidation number of an atomincrease in the number of electronegative atoms surrounding an element in changing from reactants to products.D. It loses electrons
Here's how it works!
Oxidation occurs when an atom, molecule, or ion loses one or more electrons. In the process of oxidation, the oxidation state of the chemical species increases. Originally, the term was used to describe when oxygen caused electron loss in reactions. I hope that helps you!
10) What is the volume ratio of hydrogen to oxygen in water production?
Answers
Answer:
2:1
Explanation:
Water molecules feature the combinations of hydrogen and oxygen atoms in a 2:1 ratio.
The thermite reaction ,
Fe2O3(s)+2Al(s)⟶2Fe(s)+Al2O3(s),ΔH∘=−851.5kJ/mol
is one of the most exothermic reactions known. Because the heat released is sufficient to melt the iron product, the reaction is used to weld metal under the ocean. How much heat is released per mole of Al2O3produced? How does this amount of thermal energy compare with the energy released when 2 mol of protons and 2 mol of neutrons combine to form 1 mol of alpha particles?
Answers
Answer:
Explanation:
1) The ΔH shows the heat of reaction of the reaction illustrated in the question and the negative sign shows the reaction is an exothermic reaction, meaning heat is released in this reaction. The amount of heat released in this reaction is 851.5 kilojoules per mole of Al₂O₃ produced.
2) The thermal energy of this reaction is however very low when compared to the energy released when 2 moles of protons and 2 moles of neutrons combine to form 1 mole of alpha particles. This is because, the reaction illustrated in the (1) above is a normal chemical reaction while the one that involves the protons and neutrons (as described in this section 2) is a nuclear reaction which involves large amount of energy. Nuclear reactions usually involve way larger amount of energy than ordinary chemical reactions.
what element have 3 PELS?
Answers
Answer:
boron aluminum gallium indium
Explanation:
hope this helps you
a student made the table shown to list some contact and non contact forces
Answers
b bbbbbbbbbbbbbbbbbbbbbbbbbb
When 80.0 mL of a 0.812 M barium chloride solution is combined with 40 mL of a 1.52 M potassium sulfate solution, 10.8 g of barium sulfate precipitates. What is the % yield of this reaction
Answers
Answer:
76.1%
Explanation:
The reaction that takes place is:
BaCl₂ + K₂SO₄ → BaSO₄ + 2KClFirst we determine how many moles of each reactant were added:
BaCl₂ ⇒ 80 mL * 0.812 M = 64.96 mmol BaCl₂ K₂SO₄ ⇒ 40 mL * 1.52 M = 60.8 mmol K₂SO₄Thus K₂SO₄ is the limiting reactant.
Using the moles of the limiting reactant we calculate how many moles of BaSO₄ would have been produced if the % yield was 100%:
60.8 mmol K₂SO₄ * [tex]\frac{1mmolBaSO_4}{1mmolK_2SO_4}[/tex] = 60.8 mmol BaSO₄Then we convert that theoretical amount into grams, using the molar mass of BaSO₄:
60.8 mmol BaSO₄ * 233.38 mg/mmol = 14189.504 mg BaSO₄14189.504 mg BaSO₄ / 1000 = 14.2 g BaSO₄Finally we calculate the % yield:
% yield = 10.8 g / 14.2 g * 100 %% yield = 76.1%Five liters of air at -36 c is warmed to 89c. what is the new volume if the pressure remains constant?
Answers
Answer:
Explanation:
The altitude is irrelevant, except as needed to define the pressure. In this example all three parameters of the Ideal Gas Laws are changing. We set up the equation to solve for the desired final volume. Start with the Ideal Gas Law:
P
⋅
V
=
(
n
⋅
R
⋅
T
)
where the number of moles of gas and the gas constant do not change.
(
P
V
T
)
1
=
(
P
V
T
)
2
Rearrange for the desired
V
2
, Temperatures must be in ‘K: 298 & 283.
(
P
1
V
1
T
1
)
×
T
2
P
2
=
V
2
V
2
=
P
1
×
V
1
×
T
2
T
1
×
P
2
V
2
=
730
×
855
×
283
298
×
605
=
980
L
“Change” in volume is
980
–
855
=
125
L
What does the theory of continental drift state?
A
All the continents were once one continent that broke up and drifted apart over hundreds of millions of years.
B
The continents have always been separate but may one day drift together to form a single continent.
C
The layout of the continents is the same today as it has always been.
D
New continents are continually being created and destroyed.
Answers
calculate the enthalpy change for reaction in kjmol-1
Answers
Answer:
I got
−
902 kJ
for the reaction as-written. How would you rewrite this into
kJ/mol NH
3
?
The standard molar enthalpy of formation is for the formation of
1 mol
of product from its elements as they exist in nature at
25
∘
C
and
1 atm
. For example...
1
2
N
2
(
g
)
+
3
2
H
2
(
g
)
→
NH
3
(
g
)
,
Δ
H
∘
f
(
NH
3
(
g
)
)
=
−
45.9 kJ/mol
But that also means formation of elements in their standard states must yield zero enthalpy change:
1
2
O
2
(
g
)
→
1
2
O
2
(
g
)
,
Δ
H
∘
f
(
O
2
(
g
)
)
=
0
That means we can simply derive from Hess's law and that fact to get:
Δ
H
∘
r
x
n
=
∑
P
n
P
Δ
H
∘
f
,
P
−
∑
R
n
R
Δ
H
∘
f
,
R
where
n
indicates the mols of product
P
or reactant
R
. Here we actually have just summed many formation reactions together that we know have
Δ
H
∘
r
x
n
=
Δ
H
∘
f
.
Here we have:
Δ
H
∘
r
x
n
=
[
4 mols NO
(
g
)
⋅
Δ
H
∘
f
,
N
O
(
g
)
+
6 mols H
2
O
(
g
)
⋅
Δ
H
∘
f
,
H
2
O
(
g
)
]
−
[
4 mols NH
3
(
g
)
⋅
Δ
H
∘
f
,
N
H
3
(
g
)
+
0 kJ/mol
]
where we have set a zero contribution
O
2
(
g
)
right off the bat.
=
[
4 mols NO
(
g
)
⋅
91.3 kJ/mol
+
6 mols H
2
O
(
g
)
⋅
−
241.8 kJ/mol
]
−
[
4 mols NH
3
(
g
)
⋅
−
45.9 kJ/mol
+
0 kJ/mol
]
=
[
−
1085.6 kJ
]
−
[
−
183.6 kJ
]
=
−
902 kJ
for the reaction as-written.
Explanation:
Which statement describes how the binary ionic compound KBr is named?
Answers
Which statement describes how the binary ionic compound KBr is named? The metal is named first, and the name is unchanged. Which of these is a property of a substance that is composed of atoms that are held together by ionic bonds?
B. The metal is named first and the name is unchanged.
Under conditions of constant temperature and amount of substance, a plot of pressure VS. volume for an ideal gas will result in:__________.
a) a line
b) a parabola
c) a logarithmic function
d) none of the above
Answers
Answer:
d) none of the above
Explanation:
The law that describes the relationship between pressure and volume of an ideal gas (under constant temperature and amount of substance) is Boyle's law.
It states that pressure is inversely proportional to the volume. This would mean that a graph of P vs 1/V would be a line.
See the attached picture for a graph of P vs V.
A plot of pressure VS. volume for an ideal gas will result in d) none of the above
The following things should be considered:
Boyle's law means the law that shows the relationship that lies between the pressure and volume of ideas gas that involved the same temperature and the substance amount.Also, the pressure should be inversly proportional with respect to the volume.Therefore we can conclude that a plot of pressure VS. volume for an ideal gas will result in d) none of the above
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The table below shows the number of sub-atomic particles in an atom of boron.
What is the amu of a boron atom?
a. 5
b. 6
c. 10
d. 11
Answers
op. c 10 is ur ans
HOPE THIS HELPS!!
Answer:
11 amu=Protons+Nuetrons the actual amu in the period table is 10.8
Explanation:
amu is Protons + nuetrons (5+6) = 11
This can be crossed checked with a periodic table where it has a amu of 10.8 which can be rounded up to 11.
3. Will a paper airplane with longer wings fly farther than shorter wings?
Independent variable
Answers
Yes, the more air that can get under the wings the longer the airplane will stay airborne increasing the chances it will fly farther.
What is an independent variable ?It is an independent variable that doesn't alter as a result of the other variables you're attempting to assess. An independent variable could be something like a person's age. Other aspects of a person's life, like as what they eat, how much they attend school, or how much television they watch, won't alter their age.
Design of the paper aircraft would be your independent variable, and flight distance would be your dependent variable. Your constants would be things like where you are when you fly the planes, who is flying them, how they launch, the kind of paper used to build them, etc.The plane was tested to see how far it would fly as each paper clip was added. The manipulated variable was the mass of the plane (the quantity of paper clips added). The flying distance was the responding variable. The experiment's controlled variable was the usage of the same plane in each trial.Learn more about Independent variable here:
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How do electrons in the same orbital move?
Answers
Glycerol is an extremely viscus solution, density of 1.26 g/cm3, that is usually measured by weight. How many grams of glycerol are required for a reaction that calls for 3.16 mL of glycerol.
Answers
Taking into account the definition of density, the mass of grlycerol required is 3.9816 g.
Definition of densityDensity is a quantity that is defined as the measurement of the amount of mass in a given volume of a substance.
Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
density= mass÷ volume
You can observe that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Mass of glycerolIn this case, you know that:
Density= 1.26 g/cm³Volume= 3.16 mL= 3.16 cm³ (being 1 mL= 1 cm³)Replacing in the definition of density:
1.26 g/cm³= mass÷ 3.16 cm³
Solving:
mass= 1.26 g/cm³ ×3.16 cm³
mass= 3.9816 g
In summary, the mass of grlycerol required is 3.9816 g.
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If a truck's tires are filled to a pressure of 2.38 atm when they are 25.0
degrees Celsius, what would their pressure be, if the temperature of the
tire goes up to 52.78 degrees Celsius after driving on the highway.
Answers
Answer:
P₂ = 2.60 atm
Explanation:
Given data:
Initial pressure = 2.38 atm
Initial temperature = 25.0 °C
Final pressure = ?
Final temperature = 52.78°C
Solution:
Initial temperature = 25.0 °C (25.0+273 = 298 K)
Final temperature = 52.78°C (52.78+273 = 325.78 K)
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
2.38 atm / 298 K = P₂/325.78 K
P₂ = 2.38 atm × 325.78 K / 298 K
P₂ = 775.35 atm. K /293 K
P₂ = 2.60 atm
If bovine haemoglobin has an extinction coefficient of 30910 L mol-1 cm-1 at 570 nm in PBS, what is the concentration of a solution reading an absorbance of 0.7?
Answers
hey sisterrrrrrrrrr its ginger charles here i hear you looking for the answer well this is your lucky day the answer is
Explanation:
The concentration of Bovine Hb with absorbance 0.7 at 570 nm has been 2.264 [tex]\mu[/tex]M.
According to Beer's law, the absorbance of the sample can be given by:
Absorbance = Extinction coefficient [tex]\rm \times[/tex] concentration [tex]\times[/tex] path length
The Bovine Hb has the extinction coefficient = 30910 L/mol/cm
The absorbance = 0.7
The path length has been 1 cm.
The concentration of the Bovine Hb can be given as:
0.7 = 30910 [tex]\times[/tex] concentration [tex]\times[/tex] 1
The concentration of Bovine Hb = 2.264 [tex]\rm \times\;10^-^6[/tex] moles/L
The concentration of Bovine Hb = 2.264 [tex]\rm \mu[/tex]moles/L
The concentration of Bovine Hb = 2.264 [tex]\mu[/tex]M.
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PLS HELP PLS HELP PLS
Answers
Answer: liver and pancreas
Explanation:the pancreas makes insulin and the liver makes liquid to break down the food
Answer:
3) pancreas and liver.........
What isotope has 12 protons, 13 neutrons and 12 electrons?
Answers
Answer: Magnesium
Magnesium, in its elemental form, has 12 protons and 12 electrons. The neutrons are a different matter. Magesium's average atomic mass is 24.305 atomic mass units, but no magnesium atom has exactly this mass.
Hope this helps....... Stay safe and have a Merry Christmas!!!!!!!! :D
In a climatological sense, dryness is a function of both annual rainfall and ________.
This a geology question.
Answers
Answer:
In a climatological sense, dryness is a function of both annual rainfall and evaporation
PLEASE HELP ME OUT!!!!!
Answers
Answer:
89.1942....
Explanation:
abundance x mass on each one, the added all together:
77.742+6.201+5.251
is yeast living or non living?
Answers
Answer:
Yeast is living.
Explanation:
Yeast is a type of fungus used in making bread. Fungus is a group of living organisms.
How many liters of a 3 M NaOH stock solution would you need to make 552 mL of a 105 mM NaOH dilution
Answers
Answer:
0.01932 L
Explanation:
First we convert 105 mM to M:
105 mM / 1000 = 0.105 MNext we convert 552 mL to L:
552 mL / 1000 = 0.552 LThen we use the following equation:
C₁V₁=C₂V₂Where:
C₁ = 3 MV₁ = ?C₂ = 0.105 MV₂ = 0.552 LWe input the given data:
3 M * V₁ = 0.105 M * 0.552 LAnd solve for V₁:
V₁ = 0.01932 L
A car travels 30 miles on one gallon of gasoline. Gasoline costs $4.00 per gallon. Calculate the cost of driving the car 300 miles.
Answers
Answer:
40$$$
Explanation:
Reason: 300 miles × 1gallon30miles × $4.001gallon = $40
How many total molecules will be present when the reaction of 5,000 molecules of CS2 with 15,000 molecules of 0 2 goes to completion?
CS2(1)+3 02(g) CO2(g) + 2S02(g)
(A) 5,000
(B) 10,000
(C) 15,000
(D) 20,000
Answers
Answer:
(C) 15,000
Explanation:
The equation is ...
CS₂ +3O₂ ⇒ CO₂ +2SO₂
This indicates 1 molecule of CS₂ combines with 3 molecules of O₂ to produce 1 molecule of CO₂ and 2 molecules of SO₂.
Counting molecules, we see that the original 4 molecules in a 1:3 ratio become 1+2 = 3 molecules. The reactants present are in the necessary 1:3 ratio of CS₂ : O₂, so there are no limitations on the reaction. It can use all of the original molecules to produce ...
(3/4)(20,000) = 15,000
molecules of product.
When the reaction completes, there will be 15,000 molecules present.
Identify the conjugate acid/base pairs present in an aqueous solution of hydrogen sulfate ion, HSO4-.
Answers
Explanation:
conjugate acid/base pairs are compounds which differ by the hydrogen ion (H⁺)
The conjugate based is formed when an acid donates a proton.
HSO₄⁻ --> H⁺ + SO₄²⁻
The conjugate base of HSO₄⁻ is SO₄²⁻
The conjugate acid is formed when a base accepts a proton.
HSO₄⁻ + H⁺ --> H₂SO₄
The conjugate acid of HSO₄⁻ is H₂SO₄
please help me this is due soon i really need help :'c
************24 POINTS!*********
Answers
Answer:
carbohydrates, lipids, proteins, and nucleic acids.
Explanation:
Carbohydrates serve several key functions in your body. They provide you with energy for daily tasks and are the primary fuel source for your brain's high energy demands.
The functions of lipids include storing energy, signaling, and acting as structural components of cell membranes. Lipids have applications in the cosmetic and food industries as well as in nanotechnology.
Protein has many roles in your body. It helps repair and build your body's tissues, allows metabolic reactions to take place and coordinates bodily functions. In addition to providing your body with a structural framework, proteins also maintain proper pH and fluid balance.
The functions of nucleic acids have to do with the storage and expression of genetic information. Deoxyribonucleic acid (DNA) encodes the information the cell needs to make proteins. A related type of nucleic acid, called ribonucleic acid (RNA), comes in different molecular forms that participate in protein synthesis.
If 4.73 g Ar are added to 3.22 atm He in a 2.00 L cylinder at 27.0 °C. what is the total pressure of the resulting gaseous mixture?
Answers
Answer:
4.67 atm
Explanation:
Step 1: Given data
Mass of Ar (mAr): 4.73 gPartial pressure of He (pHe): 3.22 atmVolume of the container (V): 2.00 LTemperature (T): 27.0 °CStep 2: Convert "T" to Kelvin
We will use the following expression.
K = °C + 273.15
K = 27.0 °C + 273.15 = 300.2 K
Step 3: Calculate the moles of Ar
The molar mass of Ar is 39.94 g/mol.
4.73 g × 1 mol/39.94 g = 0.118 mol
Step 4: Calculate the partial pressure of Ar
We will use the ideal gas equation.
pAr × V = nAr × R × T
pAr = nAr × R × T / V
pAr = 0.118 mol × (0.0821 atm.L/mol.K) × 300.2 K / 2.00 L
pAr = 1.45 atm
Step 5: Determine the total pressure of the gaseous mixture
The total pressure of the gaseous mixture is equal to the sum of the partial pressures of the individual gases.
P = pAr + pHe = 1.45 atm + 3.22 atm = 4.67 atm
The mass of 3.02 x 10^22 molecules of water is ___.
Answers
Answer:
0.9 g (approximately)
Explanation:
What do osmosis, diffusion, filtration, and the movement of ions away from like charge all have in common?
Answers
Moving material along certain gradients is necessary for osmosis, diffusion, filtration, and the transport of ions away from similar charges.
Osmosis is the flow of solvent molecules over a semi-permeable membrane from an area of lower concentration to a region of higher concentration Molecules diffuse when they travel from one area of higher concentration to another area of lower concentration The process of filtering involves moving liquid substances through a separating material known as a filter in order to separate solid particles from liquid. Due to the difference in pressures between the solid and liquid substances, this process is made feasible. Because of the difference in electrical potentials between the charges, ions move away from like charges.
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