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Some Basic Concepts of Chemistry
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11/08/2021 11:02 am
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The concentrated sulphuric acid that is peddled commercial is 95% H2SO4 by weight. If the density of this commercial acid is 1.834 g cm-3, the molarity of this solution is
(a) 17.8 M
(b) 12.0 M
(c) 10.5 M
(d) 15.7 M
1 Answer
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11/08/2021 11:21 am
Correct answer: (a) 17.8 M
Explanation:
95% H2SO4 by weight means 100g H2SO4 solution contains 95g H2SO4 by mass.
Molar mass of H2SO4 = 98g mol-1
Moles in 95g = \(\frac{95}{98}\) = 0.969 mole
Volume of 100g H2SO4
= \(\frac{mass}{density}\) = \(\frac{100g}{1.834g\;cm^{-3}}\)
= 54.52 cm3 = 54.52 × 10-3 L
Molarity = \(\frac{Moles \; of\;solute}{Volume\;of\;solute\;in\;L}\)
= \(\frac{0.969}{54.52\times 10^{-3}}\)
= 17.8M