Percent Yield and concentration help please!

[emilymayzes]

Please show and explain the work to figure out these questions

 

1. you react 3.50 g of solid sodium metal with water to produce hurdogen gas and sodium hydroxide. if at the end of the reaction there is 6.8 l of solution, what is the concentration of sodium hydroxide?

Answer: 0.022 M NaOH

 

2. an excess of aqueous calcium chloride is reacted with 350 ml of .650 M aqueous sodium carbonate. if 10g of a solid is produced, what is the percent yield

Answer: 43.8%

[John Cuthber]

Should this be in the homework help section?

[elementcollector1]

Yes, yes it should.

Step 1) Calculate how many moles of reactants and products, using molar masses and stoichiometry. Since molarity is defined as moles per liter, you should be able to work out what to do from here.