SATHEE: Some Basic Concepts Of Chemistry Question 40

Some Basic Concepts Of Chemistry Question 40

Question: The concentrated sulphuric acid that is peddled commercial is 95% $H_{2} S O_{4}$ by weight. If the density of this commercial acid is $1.834 g c m^{- 3}$ , the molarity of this solution is

Options:

A) 17.8 M

B) 12.0.M

C) 10.5 M

D) 15.7 M

Show Answer

Answer:

Correct Answer: A

Solution:

[a] 95% $H_{2} S O_{4}$ by weight means 100g $H_{2} S O_{4}$ solution contains 95g $H_{2} S O_{4}$ by mass. Molar mass of $H_{2} S O_{4} = 98 g m o l^{- 1}$ Moles in $95 g = \frac{95}{98} = 0.969$ mole Volume of $100 g, H_{2} S O_{4}$ $= \frac{m a s s}{d e n s i t y} = \frac{100 g}{1.834 g c m^{- 3}}$

$= 54.52 c m^{3} = 54.52 \times 10^{- 3} L$

$M o l a r i t y = \frac{Moles of s o l u t e}{Voime of solute in L}$

$= \frac{0.969}{54.52 \times 10^{- 3}} = 17.8 M$

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Some Basic Concepts Of Chemistry Question 40

Question: The concentrated sulphuric acid that is peddled commercial is 95% H2SO4 by weight. If the density of this commercial acid is 1.834gcm−3 , the molarity of this solution is

Options:

Answer:

Solution:

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Question: The concentrated sulphuric acid that is peddled commercial is 95% $H_{2} S O_{4}$ by weight. If the density of this commercial acid is $1.834 g c m^{- 3}$ , the molarity of this solution is