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Which of the following mixtures of water and H₂SO₄ would have mass percentage of H₂SO₄ close to 30?

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30 g H₂SO₄+ 100 g H₂O

1 mol of H₂SO₄+ 2 mol of H₂O

1 mol of H₂SO₄+ 200g of H₂O

0.30 mol H₂SO₄+ 0.70 mol H₂O

answer is C.

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Detailed Solution

Mass present in one mole of H₂SO₄ is 98 g. Solution of H₂SO₄ and water present in third option is the correct option.

$Mass percentage = \frac{Mass of H_{2} {SO}_{4}}{Mass of solution} \times 100 = \frac{98}{298} \times 100 = 32.88 % ≅ 30 %$

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