Calculate how many grams of dilute sulfuric acid and dilute nitric acid are added according to the draw.

(1) According to the law of conservation of mass and the reaction between potassium hydroxide and dilute nitric acid, the mass of added dilute nitric acid is calculated as follows: 98g-56g = 42g；; So the answer is: 42; (2) Let the mass of dilute nitric acid solute used be xhNO3+KOH ═ Kno3+H2O 63 56x56g×10% 63x = 5656g×10% x = 6.3g. The mass fraction of dilute nitric acid solute used is 6.3g 42g×10.