a) PTHH: \(2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O\)
b) Ta có: \(\left\{{}\begin{matrix}n_{KOH}=0,5\cdot1=0,5\left(mol\right)\\n_{H_2SO_4}=\frac{200\cdot46\%}{98}=\frac{46}{49}\left(mol\right)\end{matrix}\right.\)
Xét tỉ lệ: \(\frac{0,5}{2}< \frac{\frac{46}{49}}{1}\) \(\Rightarrow\) H2SO4 còn dư
c) Theo PTHH: \(\left\{{}\begin{matrix}n_{K_2SO_4}=\frac{1}{2}n_{KOH}=0,25mol\\n_{H_2SO_4\left(dư\right)}=\frac{135}{196}\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}m_{K_2SO_4}=0,25\cdot174=43,5\left(g\right)\\m_{H_2SO_4\left(dư\right)}=\frac{135}{196}\cdot98=67,5\left(g\right)\end{matrix}\right.\)