Question

s Calculate the molecule masses
of: NH³, CH³, OH.​

Answer 1

and for ch3

But CH3 with a little bit of rounding is about 15 g/mole or 15 amu/molecule. In case you meant CH4, this molecule is about 16 g/mole or 16 amu/molecule. And in case you meant NH3, this molecule is about 17 g/mole or 17 amu/molecule.

for OH

17.008 g/mol

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