The main job of these systems is to break down food and for it to exit the body after taking out of it what is necessary such as nutrients
2Ca + 2H2O —-> Ca(OH)2 + H2
Arrow head shows the direction of products formed in a reaction. so we can say that it denotes the direction of the chemical reaction. I.e From Reactant to Product.
so, the correct choice is B
Moles CO = 10.0 g / 28.01 g/mol = 0.357
<span>the ratio between CO and CO2 is 2 : 2 ( or 1 : 1) so we would get 0.357 mole of CO2 ( 100% yield) </span>
<span>mass CO2 = 0.357 mol x 44.0098 g/mol = 15.7 g ( theoretical yield) </span>
<span>% yield = 12.8 x 100 / 15.7 = 81.5
Hope this helps.</span>