If , then the value of is…

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Problem

a = 49 \text{ g H}_2\text{SO}_4 + (3 \times 10^{23} \text{ molecule H}_2\text{SO}_4) - (0.02 N \text{H}_2\text{SO}_4)

, then the value of

a

is : (1) 0.9 mol (2) 0.99 mol (3) 0.8 mol (4) 0.88 mol