How many grams of Cu will be produced if 15.8 grams of Cu2S got consumed? Cu2 S + O2 + 2Cu + SO2
6.31 g
79.1 g
none of the choices
12.6 g
39.6 g

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.

Match the formula for the following compound:   magnesium sulfate heptahydratemgs·7h2omg2so4·7h2omg(so4)2·7h2omgso4·7h2o

+= + + balance the equation on coefficients, ex. 1,1,1