[kverge]

Another Questions. Sorry, my teacher is completely useless.

The Question: 2Ag(s) + Zn(NO3)2(ag) --> Zn(s) + AgNO3(aq)  The production Rate of Zn(s) is 10.7g/s. Calculate the mass of silver (in kg) reacted in 15.2 minutes.

The answer is 32.2 kg Ag according to the answer key. I used the formula Rate(10.7g/s)=Mass/Time(15.2min) and can't get the correct answer (I got 9.7584KG). Is the rate different for silver as for Zinc. If so, why?

Thanks again.

[Corribus]

Yes and no. The rate in g/s will differ. The rate in mol/s will not. For every one mole of Zn(s) produced, one mole of AgNO3 (aq) is produced. And for every mole of AgNO3 (aq) produced, one mole of Ag is produced. But one mole of Zn does not have the same mass as one mole of Ag, so the mass production rates are not equivalent.

In short, you need to account for stoichiometry.

[mjc123]

The equation is not balanced. There should be a 2 before AgNO₃