A sample of 5.0 g of hydrogen gas reacts with 5.0 g of oxygen gas. 2H2 (g) + O2 (g) → 2H2O(l)

a. What is the theoretical yield of water?

b. What is the limiting reactant?

c. What is the excess reactant?

d. How much excess reactant remains?

e. If 4.2 g of water is actually produced, what is the percent yield?

A sample of 10.5 g of nitrogen reacts with 20.2 g of hydrogen to produce ammonia.

3H2 (g) + N2 (g) → 2NH3 (g)

a. What is the theoretical yield of water?

b. What is the limiting reactant?

c. What is the excess reactant?

d. How much excess reactant remains?

e. If 4.2 g of water is actually produced, what is the percent yield?

11. phosphorus-32 is radioactive and has a half life of 14 days. how much of a 124 mg sample of phosphorus-32 is present after 56 days? a) 7.75 mg b) 15.5 mg c) 31.0 mg d) 62.0 mg

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н, о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.

If 3 moles of a compound use 24 j of energy in a reaction, what is the a hreaction in j/mol?