Question

which of the following contains the most moles of atoms?
answer:
a 1 g of helium
b 1 g of carbon
c 1 g of uranium
d all contain equal number of atoms.

Explanation:

Step1: Calculate moles for each element

Use the formula \(n=\frac{m}{M}\), where \(n\) is moles, \(m\) is mass (\(m = 1g\) for all), and \(M\) is molar mass.

• For helium (\(He\)): \(M_{He}=4g/mol\), \(n_{He}=\frac{1g}{4g/mol}=0.25mol\)
• For carbon (\(C\)): \(M_{C}=12g/mol\), \(n_{C}=\frac{1g}{12g/mol}\approx0.083mol\)
• For uranium (\(U\)): \(M_{U}=238g/mol\), \(n_{U}=\frac{1g}{238g/mol}\approx0.0042mol\)

Answer:

A. 1 g of helium