- What are ratios used for scaling?

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Calculate the amount of heat (in kJ) required to vaporize 2.78kg of water at its boiling point. ( ΔHvap=40.7 kJ/mol at 100 ∘C)? Can someone help my step by step simplying these problems by combining like terms.? What is the Molar mass of Copper (II) sulfate dihydrate? Can someone help me solve this math problem step by step? A sample of gas has a mass of 0.545g. Its volume is 117mL at a temperature of 84C and a pressure of 741mm Hg. Find the molar mass of the gas?