How many tons of zinc can be obtained from 976 tons of zinc ore that is 78.0% zinc carbonate?

First, calculating the amount of zinc carbonate by multiplying the given mass of the ore by the percent zinc carbonate.

mass of zinc carbonate = (976 tons) (0.78)

= 761.28 tons

Then, calculate for %Zn in zinc carbonate

%Zn = ((65.38) / (125.39)) x 100%

% Zn = 52.141%

tons of Zn from the sample,

mass of Zn = (761.28 tons) (0.52141)

= 396.94 tons Zn