Complete the problems showing all of your formulas, work, units and significant digits. Calculate the number of moles of helium gas used to inflate a...

Complete the problems showing all of your formulas, work, units and significant digits.

1.

Calculate the number of moles of helium gas used to inflate a 2.00 L balloon at STP.

2.

An exhausted cross

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country skier inhales 2.50 L of oxygen at STP. Calculate the mass of

oxygen inhaled.

3.

What is the volume at STP of 20.0 t of sulfur dioxide gas released as a pollutant into the

air by a manufacturing plant. (1t = 1000 kg)