Calculating the mass of the reaction and the concentration

Question

Discussion:

Chemistry: Calculating the Mass of the Reaction and the Concentration

1. For the reaction shown, calculate how many moles of NO₂ form when each amount of reactant completely reacts. 2N₂O₅(g)→4NO₂ (g)+O₂ (g)

2.0mol N₂O₅
6.4mol N₂O₅
10.0g N₂O₅
1.50kg N₂O₅

2. For each reaction, calculate the mass (in grams) of the product formed when 10.1g of the underlined reactant completely reacts.

3. Assume that there is more than enough of the other reactant.

2K(s)+Cl₂ (g) - - - - - →2KCl(s)
2K(s)+Br₂ (l) - - - - - →2KBr(s)
4Cr(s)+3O₂ (g) - - - - - →2Cr₂O₃ (s)
2Sr(s) - - - - +O₂(g)→2SrO(s)

4. What is the concentration of K + in 0.15 M of K₂S ?

5. A scientist wants to make a solution of tribasic sodium phosphate, Na 3 PO 4 , for a laboratory experiment. How many grams of Na 3 PO 4 will be needed to produce 275mL of a solution that has a concentration of Na + ions of 1.40M ?