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A 3.9 mol sample of Kr has a volume of 301 mL. How many moles of Kr are in a 3.79 L sample at the same temperature and pressure?andCalculate the density, in grams per liter, of a gas at STP if 2.86 L of the gas at 16.8 °C and 754.9 mm Hg weighs 0.401 g.

Question

A 3.9 mol sample of Kr has a volume of 301 mL. How many moles of Kr are in a 3.79 L sample at the same temperature and pressure?

and

Calculate the density, in grams per liter, of a gas at STP if 2.86 L of the gas at 16.8 °C and 754.9 mm Hg weighs 0.401 g.

check_circleAnswer
Step 1

From gas equation:

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Step 2

At constant temperature and pressure, volume is proportional to number of moles.

 

Thus,

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Step 3

Thus, number of moles of Kr in the given sample at same temperature and pressure i...

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