Answer
$$5.62 \space M \space HNO_3$$
Work Step by Step
1. Calculate the molar mass:
$ HNO_3 $ : ( 1.008 $\times$ 1 )+ ( 14.01 $\times$ 1 )+ ( 16.00 $\times$ 3 )= 63.02 g/mol
2. Use the informations as conversion factors to find the molarity of this solution:
$$\frac{ 30.00 g \space HNO_3 }{100 \space g \space solution} \times \frac{1 \space mol \space HNO_3 }{ 63.02 \space g \space HNO_3 } \times \frac{ 1.18 \space g \space solution}{1 \space mL \space solution} \times \frac{1000 \space mL}{1 \space L} = 5.62 \space M$$
