moles, molecules, and grams worksheet\n1) how many molecules are there in 24 grams of fef₃?
moles, molecules, and grams worksheet\n1) how many molecules are there in 24 grams of fef₃?
Answer
Explanation:
Step1: Calculate molar mass of FeF₃
The molar mass of Fe (iron) is approximately 55.85 g/mol, and the molar mass of F (fluorine) is approximately 19.00 g/mol. For FeF₃, the molar mass $M$ is $M = 55.85+3\times19.00=55.85 + 57.00=112.85$ g/mol.
Step2: Calculate number of moles
The number of moles $n$ of a substance is given by the formula $n=\frac{m}{M}$, where $m$ is the mass of the substance. Given $m = 24$ g and $M=112.85$ g/mol, then $n=\frac{24}{112.85}\approx0.213$ mol.
Step3: Calculate number of molecules
According to Avogadro's number, 1 mole of any substance contains $N_A = 6.022\times 10^{23}$ molecules. So the number of molecules $N$ in 0.213 mol of FeF₃ is $N=n\times N_A=0.213\times6.022\times 10^{23}\approx1.28\times 10^{23}$ molecules.
Answer:
$1.28\times 10^{23}$ molecules