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bobpursleyl

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2.7moles of Cu is 2.7*Avag number of atoms.. each atom takes two electrons. electrons= 2*2.7*avagnumber charge=electrons*chargeonOneelectron = 2*2.7*avagnumber*1.60217657 × 10-19 current required=charge/time Well, I have went further than the question
marble is calcium carbonate. Any acid reacting with a carbonate gives off H20, a salt, and carbon dioxide H2C2O4 + CaCO2>>>CO2 + H20 + CaC2O2 you balance it.
ratio 1.2:4::X:10 or in fraction form 1.2/4=x/10 x=10*1.2/4=you do it
what is 500(15/20)^2
A is the best choice.
and...?

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