Sulfur hexafluoride gas is collected at 14.0°c in an evacuated flask with a measured volume of 5.0l. when all the gas has been collected, the pressure in the flask is measured to be 0.090atm . calculate the mass and number of moles of sulfur hexafluoride gas that were collected. be sure your answer has the correct number of significant digits.

The mass and number of moles of sulfur hexafluoride gas is 2.8 g and 0.019 moles respectively.

Explanation:

To calculate the moles of sulfur hexafluoride gas, we use the equation given by ideal gas:

PV = nRT

where,

P = Pressure of sulfur hexafluoride = 0.090 atm

V = Volume of the sulfur hexafluoride gas = 5.0 L

n = number of moles of gas = ?

R = Gas constant =

T = Temperature of sulfur hexafluoride gas =

Putting values in above equation, we get:

To calculate the mass of sulfur hexafluoride, we use the equation:

Molar mass of sulfur hexafluoride = 146.0 g/mol

Moles of sulfur hexafluoride = 0.0191 moles

Putting values in equation 1, we get:

In case of multiplication and division, the number of significant digits is taken from the value which has least precise significant digits. Here, the least precise number of significant digits are 2.

Hence, the mass and number of moles of sulfur hexafluoride gas is 2.8 g and 0.019 moles respectively.

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