The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0g. What is the percent yield?
A) 75.0
B) 56.0
C) 31.5
D) 178
E) none of the above
Answer: B
Learn More :
Chemistry Chapter 8
- Hydrochloric acid reacts with barium hydroxide according to the equation: 2 HCl (aq) + Ba(OH)2 (aq) > BaCl2 (aq) + 1H2O (l) H= -118 kj Calculate the heat (in kJ) associated with the complete reaction of 18.2 grams of HCl (aq).
- Starting with 156 g Li2O and 33.3 g H2O, decide which reactant is present in limiting quantities. Given: Li2O + H2O ? 2 LiOH
- Consider a reaction of chemicals depicted as A + B ? C + D. Suppose reaction of 17.8 grams of A with 29.5 grams of B gave 24.7 grams of C. However, the theoretical yield of C for this reaction was 33.3 grams. What was the percent yield of chemical C?
- If the theoretical yield of the reaction below corresponds to 25.3 g and the percent yield of the reaction is known to be reproducibly 81.1%, calculate the actual yield. Given: Li2O + H2O ? 2 LiOH
- If the theoretical yield of the reaction below corresponds to 99.2 g and the actual yield was 60.9 g, calculate the percent yield. Given: Li2O +H2O ? 2 LiOH
- How many grams of water are needed to react with 27.2 grams of O? Given: Li2O + H2O ? 2 LiOH
- How many moles of water are needed to react with 2.2 moles of Li2O? Given: Li2O + H2O ? 2 LiOH
- Suppose a computer manufacturer can build circuit boards according to the following process: 12 resistors + 20 insulators + 8 memory chips ? 4 circuit boards. How many circuit boards could you make using 30 insulators, assuming you have enough of all the other parts?
- Consider the following equation: CO + 2 H2 ? CH3OH ?H rxn = -128 kJ Calculate the amount of heat (in kJ) associated with complete reaction of 8.08 g H2.
- Consider the following reaction: 2 Mg + O2 ? 2 MgO ?H rxn = -1203 kJ Calculate the amount of heat (in kJ) associated with complete reaction of 4 moles of Mg.
- The reaction of one mole of nitrogen gas with three moles of hydrogen gas releases 92 kJ of thermal energy to the surroundings. Which of the following is TRUE?
- Consider the reaction: 2 Al + 3Br2 ? 2 AlBr3 Suppose a reaction vessel initially contains 5.0 mole Al and 6.0 mole Br2. What is in the reaction vessel once the reaction has occurred to the fullest extent possible?
- How many grams of the excess reactant remain assuming the reaction goes to completion and that you start with 15.5 g of Na2S and 12.1 g CuSO4? Reaction: Na2S + CuSO4 ? Na2SO4 + CuS
- What is the percent yield of CuS for the following reaction given that you start with 15.5 g of Na2S and 12.1 g CuSO4? The actual amount of CuS produced was 3.05. Reaction: Na2S + CuSO4 ? Na2SO4 + CuS
- What is the theoretical yield in grams of CuS for the following reaction given that you start with 15.5 g of Na2S and 12.1 g CuSO4? Reaction: Na2S + CuSO4 ? Na2SO4 + CuS
- Which is the limiting reactant in the following reaction given that you start with 42.0 g of CO2 and 99.9 g KOH? Reaction: CO2 + 2KOH ? K2CO3 + H2O
- Which is the limiting reactant in the following reaction given that you start with 15.5 g of Na2S and 12.1 g CuSO4? Reaction: Na2S + CuSO4 ? Na2SO4 + CuS
- Which is the excess reactant in the following reaction given that you start with 15.5 g of Na2S and 12.1 g CuSO4? Reaction: Na2S + CuSO4 ? Na2SO4 + CuS
- A 24.0 g sample of nitrogen gas reacts with an excess of hydrogen gas to give an actual yield of 3.85 g NH3. What is the percent yield for this reaction? Reaction: N2(g) + 3 H2(g) ? 2 NH3(g)
- Calculate the maximum number of grams of NH3 that can be produced by the reaction of 2.00 g of N2 with 3.00 g H2. Reaction: N2(g) + 3 H2(g) ? 2 NH3(g)
- How many moles of NH3 can be produced by the reaction of 2.00 g of N2 with 3.00 g H2? Reaction: N2(g) + 3 H2(g) ? 2 NH3(g)
- How many grams of the excess reactant are left over according to the reaction below given that you start with 10.0 g of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 ? 2Al2O3
- The reaction for the oxidation of NH3 is given as: 4 NH3 + 5 O2 ? 4 NO + 6 H2O Under certain conditions the reaction will proceed at 29.8% yield of NO. How many grams of NH3 must be made to react with excess oxygen to yield 70.5 g of NO?
- A sample of 8.5 g NH3 on oxidation produces 4.5 g of NO. Calculate the percent yield. Reaction: 4 NH3 + 5 O2 ? 4 NO + 6 H2O
- If 16.0 grams of aluminum oxide were actually produced, what is the percent yield of the reaction below given that you start with 10.0 g of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 ? 2Al2O3