A few question on The Mole (chemistry)?

[BballAyer]

1. Methane (CH4) is the major component of natural gas
a) How many molecules are there in 0.100g methane?
b) How many protons are there in 0.100g methane?

2. The number of hydrogen atoms in present in 4.0g of methane CH4 is:
a) 1.5x10^23 atoms
b) 6.0x10^23
c) 2.7x10^24
d) 1.5x10^22

please show working as to how these answers are achieved

thanks in advance