Question 19
The following chemical equation is not balanced: $a\mathrm{CuO}+b\mathrm{NH}_3\to c\mathrm{Cu}+d\mathrm{N}_2+e\mathrm{H}_2\mathrm O$. Use a system of linear equations to determine the smallest positive integer coefficients $a,b,c,d,e$ that balance it. Calculate $P=a+b+c+d+e$.
