- Algebra 1 ratio and rates, please help, I don't understand!!?

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A 2.012 g sample of a compound of nitrogen and oxygen has 0.522g of nitrogen. Calculate its empirical formula.? What is the final temp (in oC) when 20.0 g of water at 25°C is mixed with 30.0 g of water at 80.°C? Specific heat of water is 4.184 J/goC.? I want to login again? The empirical formula of hydrazine is NH2, and its molecular mass is 32.0 grams. What is its molecular formula? If an object with a mass of 35 grams has a volume of 70cm cubed and its length is 40cm, what is the density of the object?