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

Answer:

176.44 g

Explanation:

Step1: Calculate number of moles

First, use Avogadro's number. The number of moles $n$ of $C_3H_8$ is given by $n=\frac{2.40\times 10^{24}\text{ molecules}}{6.02\times 10^{23}\text{ molecules/mol}}$. $n=\frac{2.40\times 10^{24}}{6.02\times 10^{23}}\text{ mol}\approx 3.99\text{ mol}$

Step2: Calculate mass

We know that 1 mole of $C_3H_8$ has a mass of 44.11 g. So the mass $m$ of $C_3H_8$ is $m = n\times\text{molar - mass}$. $m=3.99\text{ mol}\times44.11\text{ g/mol}\approx 176.44\text{ g}$