Question

Four moles of a compound x weigh 176 g. compound x is
(1)CO (2)CH4 (3)CO2 (4)Nacl

Answer 1

calculate the molar mass of all the compounds and then whose mass is 176g
compound X is that mole

Answer 2

As we know no of moles=wt/mol mass

Here mole=4

Wt=176

So n=w/m

4=176/m

M=44

Compound is Co2