Which chemical equation below does not illustrate the law of conservation of mass?

3lioh + fe(no3)3 --> 3lino3 + fe(oh)3

al4c3 + 12h2o --> 3ch4 + 4al(oh)3

2nacl + cao --> na2o + cacl2

2zn + 2hcl --> zncl2 + h2

To prevent the presence of air, noble gases are placed over highly reactive chemicals to act as inert "blanketing" gases. a chemical engineer places a mixture of noble gases consisting of 4.37 g of he, 13.36 g of ne, and 36.65 g of kr in a piston-cylinder assembly at stp. calculate the partial pressure in torr of kr.