Which statement is a correct expression of the law of conservation of mass?

Which of the following compounds does not contain molecules? question 2 options: co2 h2 nacl h2o

What is the number of atoms in 3.54 mol s

22. a flask containing 450 ml of 0.50 m h2so4 was accidentally knocked to the floor. how many grams of nahco, do you need to put on the spill to neutralize the acid according to the following equation: h2so4(aq)+2 nahcos(aq) na, so(aq) +2 h20()+2 co2(g) d) 38 g a) 2.3 g b) 9.5 g c) 19 g