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If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?

Apiece of copper has a temperature of 75.6 0c. when the metal is placed in 100.0 grams of water at 19.1 0c, the temperature rises by 5.5 0c. what is the mass of the metal?

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.