chemistry
posted by henry .
4FeCr2O4+ 8K2CO3+7O2= 2Fe2O3+8K2CrO4+8CO2
how many grams of FeCr2O3 are required to produce 44g of CO2?

44 g of CO2 is two moles, right?
We use the coefficents to make a mole ratio
2/8=x/4
so x is the moles of Iron(II) dichromate
So figure how many grams is x. 
1. Check your equation. I think you've made a typo. Fe2CrO4?? FeCrO4 perhaps? Then make sure the equation is balanced.
2. Convert 44 g CO2 to moles. moles = grams/molar mass.
3. Using the coefficients in the balanced equation, convert moles CO2 to moles of what you want.
4. Now convert moles from 3 to grams.
grams = moles x molar mass.