Which has the greatest number of molecules?
A)28 g of nitrogen, $\mathrm { N } _ { 2 }$
B)32 g of oxygen, $\mathrm { O } _ { 2 }$
C)32 g of methane,C $\mathrm { H } _ { 4 }$
D)38 g of fluorine, $\mathrm { F } _ { 2 }$

Question

Quizplus · Accepted Answer

The number of molecules in a sample can be determined by dividing the mass of the sample by its molar mass and then multiplying by Avogadro's number. The molar mass of nitrogen ($N_2$) is 28 g/mol, oxygen ($O_2$) is 32 g/mol, methane ($CH_4$) is 16 g/mol, and fluorine ($F_2$) is 38 g/mol. Since the number of moles is calculated by dividing the given mass by the molar mass, methane ($CH_4$) will have the greatest number of moles (and thus molecules) because it has the smallest molar mass among the given options, allowing for more moles of $CH_4$ in 32 g compared to the other substances.

Which Has the Greatest Number of Molecules? A)28 G of Nitrogen

Which Has the Greatest Number of Molecules?
A)28 G of Nitrogen