In order to complete a reaction, a student prepares 422.2 g of 25.67% by mass calcium nitrate solution. What is the molality of this calcium nitrate solution?
Give your answer with two decimal places

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Sodium sulfate dissolves as follows: na2so4(s) → 2na+(aq) + so42- (aq). how many moles of na2so4 are required to make 1.0 l of solution in which the na concentration is 0.10 m?

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks.energy was destroyed inside the blocks.energy was absorbed into the blocks from outside the system.energy was transferred from the warmer block to the cooler block.