Question

please answer my question

Answer 1

for question 1
use the equation

no. of molecules = (given mass/molecular mass)*Avogadros number

put the values, use the calculator(or by own) you will get the answer

for the (c) part of question 1
use the eqaution

no. of molecule = (given volume/22.4L)*Avogadros number

WARNING : convert ml to L to get the answer.

Now fot question no. second

use the samr formula as question no.1 and multiply it by the no. of proton, electron and neutron present in each molecule
for example in (a) part
first calculate the no. of molecules using the formula given in question no. 1
and then :

for electron : multiply it by 9
for proton: multiply it by 9
for neutron : multiply it by 8 (as hydrogen does not have neutron)

NOTE :: You have to calculate the number of proton, electron, and neutron in each molecule and then multiply

Important value
Avogadros no. : 6.023 * 10^23
volume at STP : 22.4L