26. in dilute nitric acid, hno, copper metal dissolves according to the following equation: how many grams of hno, are needed to dissolve 11.45 g of cu according to this equation?

30.27 g HNO3
Step by step solution:
45 g Cu x 1 mol Cu / 63.54 g Cu
= 0.1802 mol Cu 
0.1802 mol Cu x 8 mol HNO3/3 mol Cu =0.4805 mol HNO3 
Molar Mass HNO3
= 1.0 + 14.0 +3×16.0
= 63.0 g/mol
0.4805 moles HNO3 x 63.0 g HNO3/1 mol HNO3
= 30.27 g HNO3