04/30/21

How many milligrams of oxygen are required to create 8.72 liters of carbon dioxide gas at STP from the complete combustion of methane (CH4)? Answer needs to be in scientific notation.
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04/30/21

What is the maximum mass of dichloromethane (CH2Cl2) that can be formed? grams
For the following reaction, 2.46 grams of methane (CH4) are allowed to react with 26.9 grams of carbon tetrachloride .methane (CH4)(g) + carbon tetrachloride(g)  dichloromethane (CH2Cl2)(g)What is... more
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04/30/21

The theoretical yield for the reaction is 0.281 g O₂. Given that the reaction has a percent yield of 83.4%, what is the mass in g of oxygen gas that is actually produced?
4 KO₂ (s) + 2 CO₂(g) → 2 K₂CO₃(s) + 3 O₂(g)
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04/30/21

What is the mass in grams of oxygen gas that can be produced from 0.515 grams of carbon dioxide?
4 KO₂ (s) + 2 CO₂(g) → 2 K₂CO₃(s) + 3 O₂(g)
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04/30/21

What volume (in mL) of 0.250 M HCl would be required to completely react with 4.90 g of Al in the following chemical reaction?
2 Al(s) + 6 HCl(aq) → 2 AlCl₃ (aq) + 3 H₂(g)
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04/30/21

A simple pendulum consists of a small mass of 72 g suspended from a light inelastic cord. During oscillations with 50 amplitude, this pendulum completes 60 oscillations every 1 minute. Calculate:
A simple pendulum consists of a small mass of 72 g suspended from a light inelastic cord. During oscillations with 50 amplitude, this pendulum completes 60 oscillations every 1 minute.... more
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04/30/21

The index of refraction of corn oil is 1.47. What is the speed of light in corn oil. (speed of light in vacuum is 3 X 10^9 m/s)
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04/30/21

A light ray in airstrikes the interface between air and an unknown material at an angle of incidence of 15° and has an angle of refraction of 7°. What is that material’s index of refraction?
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04/30/21

A light ray in airstrikes an air-water interface at an angle of incidence of 50°. What happens? What is the angle of refraction?
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04/29/21

Really bright or hot stars on the HR-diagram plot to the lower right.

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04/29/21

A flexible container at an initial volume of 5.12 L contains

A flexible container at an initial volume of 5.12 L contains 9.51 mol of gas. More gas is then added to the container until it reaches a final volume of 13.5 L. Assuming the pressure and... more
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04/29/21

At a certain temperature and pressure, 1 L of CO2 gas weighs 1.05 g. What is the mass of 1 L of N2 gas at the same temperature and pressure? mass of 1 L of N2:

At a certain temperature and pressure, 1 L of CO2 gas weighs 1.05 g. What is the mass of 1 L of N2 gas at the same temperature and pressure? mass of 1 L of N2:
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04/29/21

If the initial temperature of an ideal gas at 2.250 atm is 62.00 ∘C, what final temperature would cause the pressure to be reduced to 1.700 atm? 𝑇=

If the initial temperature of an ideal gas at 2.250 atm is 62.00 ∘C, what final temperature would cause the pressure to be reduced to 1.700 atm? 𝑇=
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04/29/21

For the reaction C + 2H2 → CH4, how many moles of hydrogen are needed to make 107.1 grams of methane, CH4 ?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as 4.0Use the following molar masses. If you do not use these masses, the computer will mark your... more
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04/29/21

835.92 J of energy are used on a 120g chunk of lead. What would the change in temperature be? (CLead = 0.129 J/g*C)

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04/29/21

mole conversions
so i have the answers but dont know how to do the work to prove how I got the answers. can anybody help?1)     CO2 - 44.01 g/mol2)     SiBr4 - 343.65 g/mol3)     fluorine - 18.998403 g/mol4)... more
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04/29/21

Theoretical yield
Liquid ethanol (C 2 H 5 OH) and carbon dioxide gas are produced from the fermentation of solid sucrose (C 12 H 22 O 11 ) and water. 684 grams of sucrose undergoes fermentation and 349 grams of... more
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04/29/21

3 Cu  +   8HNO3  --> 3 Cu(NO3)2   +  2 NO  +  4  H2O
In the above equation how many moles of water can be made when 144.1 grams of HNO3 are consumed?Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as... more
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04/29/21

Can you provide the answer to this problem?
Sketch the graph with zeros at -2, 1 (multiplicity of 3), 5 with lowest odd degree for given zeros without a stated multiplicity and negative leading coefficient. Write your polynomial in factored... more
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04/28/21

N2 + 3H2 → 2NH3. What is the theoretical yield, the limiting reactant, and the percent yield? Please show work.
It has 3 moles of N2 that react with 3 moles of H2 and a actual of 31.63g
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04/28/21

What is the pressure of N2 (g) in Torr if 0.58 atm of O2 (g) and 1260 mmHg of He(g) are mixed with the nitrogen, and the total pressure is 2650 mmHg?
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04/28/21

I could use any help you can give with this physics problem.
A uniform ladder 10.0 m long and weighing 60 N rests against a frictionless vertical wall as shown in the figure. If the ladder is just on the verge of slipping when it makes 50 degree angle with... more
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04/28/21

Physics Projectile Motion
An aircraft flies at a height of 2000m with a constant velocity of 150 mps in a straight horizontal line. As it passes vertically over a cannon, a shell is fired. Find the minimum muzzle speed and... more
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04/28/21

Percent yield and round the answer to 3 signficant figures

Liquid hexane CH3CH24CH3 reacts with gaseous oxygen gas O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O. If 67.2g of water is produced from the reaction of 64.63g of hexane... more
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04/28/21

chemistry question
A sample of gas occupies a volume of 69.9 mL. As it expands, it does 134.9 J of work on its surroundings at a constant pressure of 783 Torr. What is the final volume of the gas?
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