Hello sir

Please clarify these two sums

1) Calculate the number of Cl2 molecules and Cl atoms in 0.25 mol of Cl2 gas.

2)  Molar mass of O is 16 g  mol-1. What is the mass of one atom and one molecule of Oxygen?

Asked by seeni2005 | 17th Feb, 2021, 11:19: AM

Expert Answer:

1) 0.25 mole of Cl2 molecules
Mass of 1 mole of Cl2 (molar mass) = 35.55 ×2 = 71 g
So, mass of 0.25 mole of Cl2 molecules = molar mass x number of moles = 71 × 0.25 = 17.75 g
 
2) Molecular mass of O = 16 u
Molecular mass of O2 = Mass of 2O atoms = 16u + 16u = 32u

Answered by Ramandeep | 17th Feb, 2021, 04:42: PM

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