Question

How many moles of potassium are needed to react completely with 7.50 mol of chromium (III) oxide? Show work.

Answer 1

45 mol

Step-by-step explanation:

First you need to balance the equation:

6K + Cr2O3 = 3K2O + 2Cr

the proportion of the coeficients of potassium and chromium oxide is 6 to 1 so we need to multiply 7.5 by 6 to get 45.