The weak base dimethylamine, NH(CH3)2, has a molar mass of 45.09g/mol and a base-dissociation constant Kb=5.4×10−4. What is the pH of an aqueous solution of dimethylamine that contains 2.04g of dimethylamine in 0.100L of solution?

The density of an unknown gas at 98°c and 740 mmhg is 2.50 g/l. what is the molar mass of the gas with work showed?

How many moles of al3+ ions are in 1.25 moles of al2o3

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.