Answer: e. none of these
Explanation:
Mass percent is the ratio of mass of solute dissolved to the mass of solution in terms of percentage.
Thus 71.0% [tex]HNO_3[/tex] means 71.0 g of [tex]HNO_3[/tex] is present in 100 g of solution
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
given mass of [tex]HNO_3[/tex] = 71.0 g
Molar mass of [tex]HNO_3[/tex] = 63.01 g/mol
Putting in the values we get:
[tex]\text{Number of moles}=\frac{71.0g}{63.01g/mol}=1.13moles[/tex]
Thus there are 1.13 moles of [tex]HNO_3[/tex]
