<span><span>2<span>KOH</span></span>+<span>SO2</span> → <span>K2SO3</span>+<span>H2O
</span></span><span><span>Ca<span>(OH)</span>2</span>+<span>CO2</span> → <span>CaCO3</span>+<span>H2O
</span></span><span><span>Ba<span>(OH)</span>2</span>+<span>SO2</span> → <span>BaSO3</span>+<span>H2O
</span></span><span><span>2<span>NaOH</span></span>+<span>SO3</span> → <span>H2O</span>+<span>Na2SO<span>4
</span></span></span>
M(C3H8)=44g/mol
W(C)=12*3 / 44*100%=81.8%
M(C6H14)=86g/mol
W(C)=12*6/86*100%=83.7%
M(C4H8)=56 g/mol
W(C)=12*4/56*100%=85.7%