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How do I find the mg/mL of a substance when given the molar mass if this sustance and the number of moles of it?

Thanks to the person who answered my previous questions.

How do I work out the amount of grams of a gas collected from a reaction with a substance with water, when given total gas pressure and...

Na2CO3 + xH2O
How do I work out the value of x when 2.558g of Na2CO3 loses 1.61g H2O upon heating at 125 degrees, leaving 0.948g Na2CO3?
The molar masses given are NaCO3=106.0 H2O=18.02

How do you balance copper II nitrate to copper II oxide, nitrogen gas and O2 gas?