2Al + Cr2O3 → Al2O3 + 2Cr
"n(Cr2O3)=\\frac{m}{M}=\\frac{50}{151.989}=0.32897"
find n(Al):
"\\frac{x}{2}=\\frac{0.32897}{1}"
x=0.6579
"m=n\\times M=0.6579\\times26.9815=17.75" g
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