Question

5g of a metal on treatment with an acid gave 224ml of h2 gas at ntp .What is the equivalent mass of the metal

Answer 1

Answer: 250 grams

Explanation:

Equivalent mass of a metal is defined as the mass which combines with 8 gram of oxygen or 35.5 grams of chlorine or 1 gram of hydrogen.

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023\times 10^{23}$ of particles.

Normal condition of temperature (NTP)  is 273 K and atmospheric pressure is 1 atmosphere respectively.

Given: Mass of metal = 5 g

22400 ml of $H_2$ at STP = 1 mole

224 ml  of  $H_2$ at STP =$\frac{1}{22400}\times 224=0.01moles$

mass of $H_2=moles\times {\text {molar mass}}=0.01\times 2=0.02 g$

0.02 gram of hydrogen combine with = 5 g of metal

So 1 gram of hydrogen combines with =$\frac{5}{0.02}\times 1=250g$ of metal

Thus equivalent mass of metal is 250 grams.