To answer number 5 and 6 on the lab, you may want to think of the wet sand that you ended up with, which I would hope you know has greater mass than the original mixture. The salt that is left over will be too little for you to acuraty measure, so no real measurements are needed, therefore, I am not posting any of the equations you saw in class. You just need to understand where the mases come from, not what they really are.
If you have any questions, just email me.
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