At the center of the Sun, the density of the gas is 1.5 ( 105 kg/m3 and

Question:

At the center of the Sun, the density of the gas is 1.5 ( 105 kg/m3 and the composition is essentially 35% hydrogen by mass and 65% helium by mass.
(a) What is the number density of protons there?
(b) What is the ratio of that proton density to the density of particles in an ideal gas at standard temperature (0°C) and pressure (1.01 ( 105 Pa)?