Question

In an experiment. it is possible to calculate the moles of oxygen from either the volume formed at STP or from the weight of oxygen generated. Which gives the more accurate value? Why?

Explain thee effect that failure to subtract the water vapor pressure from the total pressure would have on your determination of molar volume? (Would your molar volume be too high, the same, or too low and why?)

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Answer #1

It is possible to calculate the moles of oxygen from the volume formed at STP gives the more accurate value than from the weight of oxygen generated.Because oxygen naturally occurs as gas at STP. So it is difficult to weigh the gas accurately as it needs bigger falsks. But we can measure the volume of gas accurately. So it is better to use the volume of gas to calculate the moles of gas.

Molar volume = moles/ volume of the gas

Volume of gas is high than original volume of gas because there is some amount of water vapor pressure. So we get low molar volume than original molar volume for gas.

Answer is your molar volume would be too low.

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