Open Question
Determine the molar mass of Al2(SO4)3･5H2O. Provide an answer to two decimal places.
2. Atoms & Elements
Calculating Molar Mass
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What is the mass in grams of 5.47 × 10^19 molecules of CCl2F2 (molar mass = 120.91 g/mol)?
A
1.10 g
B
11.0 g
C
0.0110 g
D
0.110 g
Verified step by step guidance1
First, understand that the problem requires converting the number of molecules to grams using the molar mass of CCl2F2.
Use Avogadro's number, which is 6.022 × 10^23 molecules/mol, to convert the number of molecules to moles. Set up the conversion: \( \text{moles} = \frac{5.47 \times 10^{19} \text{ molecules}}{6.022 \times 10^{23} \text{ molecules/mol}} \).
Calculate the number of moles from the given number of molecules using the conversion factor from the previous step.
Once you have the number of moles, use the molar mass of CCl2F2 to convert moles to grams. Set up the conversion: \( \text{mass in grams} = \text{moles} \times 120.91 \text{ g/mol} \).
Calculate the mass in grams using the number of moles obtained and the molar mass of CCl2F2.
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