How many moles are in 65.4 grams of oxygen in the air we breathe? Group of...

Question

Question

How many moles are in 65.4 grams of oxygen in the air we breathe?

Group of answer choices

4.09 moles

0.489 moles

0.245 moles

2.04 moles

3.94 x 10²⁵ moles

Answer 1

Answer #1

Molar mass of O2 = 32 g/mol

mass(O2)= 65.4 g

use:

number of mol of O2,

n = mass of O2/molar mass of O2

=(65.4 g)/(32 g/mol)

= 2.044 mol

Answer: 2.04 mol

Answer 2

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