Question

what is the mass of 2.40 × 10²⁴ molecules of c₃h₈? (1 mole c₃h₈ = 44.11 g) (1 mole c₃h₈ = 6.02 × 10²³ molecules) ? g c₃h₈

Explanation:

Step1: Calculate the number of moles

Use the formula \(n=\frac{N}{N_A}\), where \(N = 2.40\times10^{24}\) molecules and \(N_A=6.02\times 10^{23}\) molecules/mol.
\(n=\frac{2.40\times 10^{24}}{6.02\times 10^{23}}\approx3.99\) mol

Step2: Calculate the mass

Use the formula \(m=n\times M\), where \(n = 3.99\) mol and \(M = 44.11\) g/mol.
\(m=3.99\times44.11\approx176\) g

Answer:

\(176\) g