What is the quantity of hydrogen gas liberated when `46 g` sodium reacts with excess ethanol ?
(Given atomic mass of `Na = 23`)

Options

A. `2.4 xx 10^(-3)kg `
B. `2.0 xx 10^(-3)kg `
C. `4.0 xx 10^(-3) kg `
D. `2.4 xx 10^(-2)kg `

Answer

B

Explanation

`underset (2 xx 23 g) (2Na_((s)))+2C_2H_5OH_((l)) to 2C_2H_5ONa + underset ("1 mole")(H_(2(g))) uarr `
1 mole of `H_2=2g` of `H_2-=2 xx 10^(-3) kg `