Calculate the mass of 25,000 molecules of nitrogen gas.  (1 mole = 6.02 x 1023 molecules)

grams

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number of particles.

To calculate the moles, we use the equation:

Now 1 mole of gas weighs = 28 grams

of gas weighs = grams

Thus the mass will be grams.

the answer to your question is c

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.