Question

va roog mult. 17........

Answer 1

$M_{EH_3}=(x+3)\ g/mol$
$H=1,2447\%$

$\frac{1,2447}{100}=\frac{3*1}{x+3} \\ \\ 1,2447\ x\ +\ 3,7341\ =\ 300 \\ 1,2447\ x\ =\ 296,2659 \\ x\ =\ 238,02\ (E=U)$