Question

Calculate the molecular (formula) mass of each compound: (a) dinitrogen pentaoxide; (b) lead(ll) nitrate; (c) calcium peroxide.

Answer 1

a) The molecular mass of each compound dinitrogen pentaoxide is 108 g/mol.

b) The molecular mass of each compound lead(ll) nitrat is 331 g/mol.

c) The molecular mass of each compound calcium peroxide is 72 g/mol.

Step-by-step explanation:

a) Molecular mass of dinitrogen pentaoxide that
`N_2O_5` be M.

Mass of nitrogen atom = 14 g/mol

Mass of oxygen atom = 16 g/mol

`M=2* 14 g/mol+5* 16 g/mol=108 g/mol`

b) Molecular mass of lead(ll) nitrate that
`Pb(NO_3)_2` be M.

Mass of lead = 207 g/mol

Mass of nitrogen atom = 14 g/mol

Mass of oxygen atom = 16 g/mol

`M=1* 207 g/mol+1* 2* 14 g/mol+3* 2* 16 g/mol=331 g/mol`

c)Molecular mass of calcium peroxide that
`CaO_2` be M.

Mass of calcium atom = 40 g/mol

Mass of oxygen atom = 16 g/mol

`M=1* 40 g/mol+2* 16 g/mol=72 g/mol`