Question

find no. of proton neutron and electron in 8g of methene​

Answer 1

Atomic mass of C is 12u and of H is 1u

There are 4 H atoms and 1 C atom.

Thus the molecular mass of CH4 is 12+1∗4=16u=16g/mol12+1∗4=16u=16g/mol

Now, 1 C atom contains 6 e−e−

and 1 H contains 1 e−e−

Total no. of electrons in 1 molecule of CH4=6+4=10

No. of moles in 8g CH4 is 8/16=1/2

In one mole CH4 there are 6.023*10^23 molecules

Each molecule contains 10 electrons.

Therefore no. of electrons in in 1/2 moles of CH4=1/2*10*6.023*10^23 electrons

Therefore there are 3.01*10^23electrons in 8g CH4