How many grams of copper should be mixed with 63 grams of zinc to form an alloy containing 55% zinc and 45% copper?

Expert Answers
tiburtius eNotes educator| Certified Educator



To calculate percentage  of zinc in an alloy of mass `m` you would use the following formula

` ` `p_("Zn")=m_("Zn")/m cdot 100`                                                             (1)

But we don't know the mass of alloy, but we do know that it contains `63"g"` of zinc and unknown mass of copper. So we have `m=m_("Zn")+m_("Cu")=63+m_("Cu")` so let's put that into (1)




`m_("Cu")=567/11 "g" approx 51.545455 "g"`