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Question

What is the mass of 3 moles of O2?


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Solution

Given: No. of moles (n)O2 = 3 moles

Number of moles(n) =Given mass(m)/Molar mass(M)
So, Given mass = Number of moles × molar mass

Molar mass O2(M) = 32g

Mass of 3 moles of O2 = nM

= 3×32

= 96g


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