Answer :
Final answer:
To calculate the number of moles for various substances, the formula mass/molar mass is used. For each substance, the proper molar mass is derived and then used to calculate the number of moles.
Explanation:
To calculate the number of moles of the indicated substance in each of the following samples, you need to apply the formula: number of moles = mass / molar mass. The molar mass is the sum of the atomic masses of all the atoms in a formula, expressed in grams/mol.
Let's compute:
A. For sodium dihydrogen phosphate (NaH2PO4) the molar mass is 138.01 g/mol. So, the number of moles = 4.26 x 10^-3 g / 138.01 g/mol = 3.09 x 10^-5 mol.
B. For copper(I) chloride (CuCl), the molar mass is 99.99 g/mol. So, the number of moles = 521 g / 99.99 g/mol = 5.21 mol.
C. For iron (Fe), the molar mass is 55.85 g/mol. So, the number of moles = 151,000 g / 55.85 g/mol = 2703 mol.
D. For strontium fluoride (SrF2), the molar mass is 125.62 g/mol. So, the number of moles = 8.76 g / 125.62 g/mol = 0.07 mol.
E. For aluminum (Al), the molar mass is 26.98 g/mol. So, the number of moles = 1.26 x 10^4 g / 26.98 g/mol = 467 mol.
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