Question

please answer this question fast. ​

Answer 1

here reaction is

Mg + 2hcl ----> Mgcl2 +H2.... (1)

now since 1 mole of mg required to liberate 1 mole of H2

3g of mg means 3/24= 1/8mole

now multiply 1/8 both side in eq... (1)

Mg/8 +hcl/4---->Mgcl2/8 + H2/8

now 1/8 mole of H2 is required

1/8×2 = 1/4 =0.25g

your answer is 0.25g