An atom of aluminum (Al) has an atomic number of 13 and a mass number of 27. How many neutrons does it have? O A. 27 O B. 40 O C. 14 D. 13

C. 14

Explanation:

The mass number is the number of protons + neutrons and the atomic number is the number of protons.

If the mass number is 27, you subtract the atomic number, 13.

27 - 13 = 14 neutrons

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.

it has both hydrogen and oxygen