If the formula weight of H2SO4 is 98, then the amount of acid present in 400 mL of 0.1 M solution of the acid will be:
A) 2.45 g
B) 3.92 g
C) 4.90 g
D) 9.80 g
To find the amount of acid present in the solution, we need to first calculate the number of moles of H2SO4 in 400 mL of 0.1 molar solution and then use the formula weight to convert moles to grams.
Given:
Formula weight of H2SO4 = 98 g/mol
Volume of solution = 400 mL
Molarity of solution = 0.1 mol/L
First, let's calculate the number of moles of H2SO4:
Number of moles = Molarity × Volume (in liters)
= 0.1 mol/L × 0.4 L
= 0.04 moles
Now, to find the amount of acid in grams, we'll use the formula weight:
Amount of acid (in grams) = Number of moles × Formula weight
= 0.04 moles × 98 g/mol
= 3.92 grams
So, the correct answer is option B) 3.92g.
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