Concept explainers
(a)
Interpretation:
Number of moles in 1 g of L-tryptophan must be found.
Concept introduction:
The number of moles is related to mass and molar mass as follows:
Number of moles

Answer to Problem 193A
Number of mole of L-tryptophan is 0.005 mol
Explanation of Solution
The molar mass of C, H, N and O is 12 g/mol, 1 g/mol, 14 g/mol and 16 g/mol respectively.
Molar mass of L-tryptophan (C11H12N2O2)
Mass is given 1 g thus, number of moles can be calculated as follows:
Number of mol
b)
Interpretation:
Number of moles in 1 g of magnesium sulfate heptahydrate must be found.
Concept introduction:
The number of moles is related to mass and molar mass as follows:
Number of moles
b)

Answer to Problem 193A
Number of mole of magnesium sulfate heptahydrate is 0.004 mol.
Explanation of Solution
Molecular formula of magnesium sulfate heptahydrate is MgSO4.7H2O. Here, molar mass of Mg, S, O and H is 24 g/mol, 32 g/mol, 16 g/mol and 1 g/mol respectively.
Thus, molar mass of H2O is 18 g/mol.
Molar mass of magnesium sulfate heptahydrate (MgSO4.7H2O)
Now, number of moles can be calculated as follows:
Number of mol
c)
Interpretation:
Number of moles in 1 g of propane needs to be determined.
Concept introduction:
The number of moles is related to mass and molar mass as follows:
Number of moles
c)

Answer to Problem 193A
Number of mole of propane is 0.023 mol.
Explanation of Solution
The molar mass of C and H is 12 g/mol and 1 g/mol respectively.
Molar mass of propane (C3H8)
The number of moles can be calculated as follows:
Number of mol
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