Chemistry Final Review... help?

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Chemistry Final Review... help?

Calculate the volume occupied at STP by 2.56 mol of oxygen

Find the molecular mass of a gas if 19.08 grams occupy 12.62 dm3 at 92.5 kPA and 52.6 C

2007-05-22 10:48:48 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry

2 answers

A mole of gas occupies 22.4 liters at STP. Use that factor to calculate the answer for your first question.

Use PV =nRT for the second. Plug in your data and solve for moles. Based on the grams given, now solve for molecular mass. Use the correct "R" value for dm3 and KPa

2007-05-22 10:52:59 · answer #1 · answered by reb1240 7 · 0⤊ 0⤋

use ideal gas law

PV=nRT

2007-05-22 17:53:16 · answer #2 · answered by mark r 4 · 0⤊ 0⤋