1. What is the volume occupied by 16.6g of argon gas at a pressure of 1.16atm an
ID: 809850 • Letter: 1
Question
1. What is the volume occupied by 16.6g of argon gas at a pressure of 1.16atm and a temperature of 374K ?
Express your answer with the appropriate units.
2.
A weather balloon is inflated to a volume of 26.9L at a pressure of 733mmHg and a temperature of 27.0?C. The balloon rises in the atmosphere to an altitude where the pressure is 395mmHg and the temperature is -15.3?C.
Assuming the balloon can freely expand, calculate the volume of the balloon at this altitude.
3.
Calculate the density of oxygen, O2, under each of the following conditions:
STP
1.00 atm and 10.0 ?C
Express your answers numerically in grams per liter. Enter the density at STP first and separate your answers by a comma.
To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 4.1-L bulb, then filled it with the gas at 1.50atm and 20.0 ?C and weighed it again. The difference in mass was 7.1g . Identify the gas.
Express your answer as a chemical formula.
4. A quantity of CO gas occupies a volume of 0.39L at 1.7atm and 350K . The pressure of the gas is lowered and its temperature is raised until its volume is 2.6L .
Find the density of the CO under the new conditions.
Express your answer to two significant figures and include the appropriate units.
5. Oxygen gas reacts with powdered aluminum according to the following reaction:
4Al(s)+3O2(g)?2Al2O3(s)
What volume of O2 gas (in L), measured at 793mmHg and 19?C, is required to completely react with 53.9g of Al?
Explanation / Answer
Answer 3 Use the following equation:
Density of a gas = (pressure x molar mass) / (R x temperature)
R = 0.0821 L*atm/mol*K.
STP stands for standard temperature and pressure. Standard temperature is 273 K. Standard pressure is 1 atm.
Don't forget to change
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