Mr(NaPH) = 1 * 23 + 1 * 31 + 1 * 1 = 55
Mr(Mg(OH)₂) = 1 * 24 + 2 * 16 + 2 * 1 = 58
Mr(C₃H₈) = 3 * 12 + 8 * 1 = 44
Mr(NaPH) = 1 * 23 + 1 * 31 + 1 * 1 = 55
Mr(Mg(OH)₂) = 1 * 24 + 2 * 16 + 2 * 1 = 58
Mr(C₃H₈) = 3 * 12 + 8 * 1 = 44