1) What is the mass of one mole O2 molecule? 2a)What is the mass of two mole O2
ID: 1023338 • Letter: 1
Question
1) What is the mass of one mole O2 molecule?
2a)What is the mass of two mole O2 ? 2b) What is the mass of 0.35 moles of O2 molecules?
(3a) How many moles of O2 in 32.0 gram of O2 gas? (3b) How many moles of O2 in 64.0 gram of O2 gas? (3c) How many moles of O2 in 40.0 gram of O2 gas?
( 4a) what is the number of O atoms in one mole of O atoms? (4b) What is the number of O atoms in one mole O2 molecules? (4c) What is the number of O atoms in 0.35 moles of O2 molecules?
(5a) Find number of O atoms in 15.0 grams of O2 gas.
Explanation / Answer
1.
molar mass of the oxygen = 32.0 g/mol
on emole of O2 means it will have avagadro no of moles cules = 6.023 x 1023
= 32 g/mol / 6.023 x 1023
= 5.13 x 10-23 grams
2a
2 moles of O2 molecules will have
= 32 g/mol / 2 x 6.023 x 1023
= 2.656 x 10-23 grams
2b
32 g/mol / 0.35 x 6.023 x 1023
1.52 x 10-22 grams
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