To X gram of a mixture of Aluminium and calcium metal, 100ml of a 2.5 M HNO3 solution is added. The gas formed during the reaction takes a volume of 0.83 L at a temperature of 25C and a pressure of 1.0316 atm mm Hg. To this solution, 10 g of Na2SO4 is added. after drying this, the weight of the precipitation is 2.79 gram.

The question: Calculate X

answer given: X = 1.061 g

-> please have the answer be close or the same as the answer that was given