A gaseous oxide contains 30.4% of nitrogen, one molecule of which contains one nitrogen atom. The density of the oxide relative to oxygen gas is.........
2.7g of Ag2Co3 on being heated strongly yields a residue weighing.......
Element A (atomic weight 12.01) and element B (atomic weight 16) combine to form a new substance X. Two moles of B combine with one mole of A. Then the weight of one mole of X is........
How many g of KCL would have to be dissolved in 60g H2O to give 25% by wt. of solution?