Question

molar mass of covalent compounds
1 h 1.01
7 n 14.01
what is the molar mass of the covalent compound n2h4?
n2h4 = ? $\frac{g}{mol}$

Explanation:

Step1: Calculate mass of nitrogen

There are 2 nitrogen atoms. Mass of N per - atom is 14.01 g/mol. So mass of N in compound is $2\times14.01$ g/mol.
$2\times14.01 = 28.02$ g/mol

Step2: Calculate mass of hydrogen

There are 4 hydrogen atoms. Mass of H per - atom is 1.01 g/mol. So mass of H in compound is $4\times1.01$ g/mol.
$4\times1.01 = 4.04$ g/mol

Step3: Calculate molar mass of $N_2H_4$

Add the mass of nitrogen and hydrogen in the compound.
$28.02+4.04 = 32.06$ g/mol

Answer:

32.06 g/mol