Answer to Question #338971 in General Chemistry for Spine injury girl

Question

1. What amounts of each species is expected to be present at the end of the reaction between 3.2 g of solid gallium and 3.2 g of gaseous oxygen? 
2. Elemental copper and HNO₃ react to form copper (II) nitrate, nitrogen dioxide, and water. What is the percent yield of the reaction where 0.185 Mg of copper and 0.0125 Tg of HNO₃ react to form 1.95 x 10²⁰ fg of nitrogen dioxide?
3. When 1.25g of H₂Se gas is bubbled into a solution containing 2.00g of potassium hydroxide, how many grams of the potassium-containing product forms, assuming that the reaction proceeds with 92.0% yield? 
4. Phosphorous and hydrogen react to form 4.00 g of product with 35.5 % yield. If 1.05 g of hydrogen remained unreacted, how much phosphorus must have been present at the start?
5. How many of each of the spectator ions are present after the reaction of 1.0g calcium sulfate and 1.0g potassium phosphate?

  

Answer 1

1. m (Ga₂O₃) = 4.3 g

m (O₂) = 1.1 g

m (Ga) = 0 g

2. The percent yield is 72.8 %

3. 2.2 g

4. 10.3 g P

5. K⁺ = 0.01413 mol SO₄^2- = 0.00735 mol