What is the % yield if 12g of magnesium is dissolved in hydrochloric acid to produce 20g of magnesium chloride?
First we need to write the balanced equation for the reaction. In this case it is Mg + 2HCl -> MgCl2 + H2. Now we need to work out the maximum theoretical yield of MgCl2 from 12g of Mg. 12g of Mg is 0.5 moles, so a maximum of 0.5 moles of MgCl2 can be created because the reaction ratio is 1:1 as our equation shows. 0.5 moles of MgCl2 weighs 47.5g. Finally we can use the equation % yield = (actual yield / theoretical yield) x 100. In this example, (20 / 47.5) x 100 = 42.1%.
HW
Related Chemistry GCSE answers
All answers ▸If 350g of NaCl is dissolved in water to a final volume of 3dm . Calculate the concentration of the solution.
Describe and explain how the reactivity of the elements changes as you go down group 1
Sodium hydroxide sol'n solution is poured into a beaker of hydrochloric acid which contains a thermometer showing room temperature. a) What is the name of the product produced? b) What type of reaction does the thermometer's temperature rise prove?
Explain why ionic compounds such as potassium sulfide have high boiling points and conduct electricity when dissolved in water?