Chemistry homework help

1. (20 pts) Given the following Reaction:
2C5H10O2 + 13O2 → 10CO2 + 10H2O
If 27.5 moles of 2C5H10O2 are reacted with an EXCESS of O2 (15 pts)
a. How many moles of O2 are used?
b. How many moles of CO2 are produced?
c. How many moles of C5H10O2 would you need to use to produce 12.4 moles of H2O Given that there is an excess of O2
2.(20 pts) Given the following Reaction:
2C5H10O2 + 13O2 → 10CO2 + 10H2O
If 15.9 moles of C5H10O2 are reacted with 101.2 moles of O2 (20 pts)
a. How many moles of H2O are produced?
b. How many moles of O2 remain after the reaction has completed
c. How many moles C5H10O2 remain after the reaction has completed
 
3.(20 pts) Given the following decomposition reaction:
4C3H5O9N3 → O2 + 12CO2 + 10H2O +6N2
a. If 42.15 g N2 of were produced what mass of O2 will be produced ?
b. If the yield of the reaction is 87.2% What mass of C3H5O9N3 would need to be decomposed to produce 10.0 g of H2O
 
4.(30 pts) Given the following Reaction:
2C3H7OH + 9O2 → 6CO2 + 8H2O
If 42.5g of C3H7OH are reacted with 89.5 g of O2
a. What mass of H2O will be produced
b. What mass of C3H7OH will remain after the reaction has completed
c. What mass of O2 will remain after the reaction has completed
d. If the yield of the reaction is 92.5% what mass of H2O would actually be produced
 
 
 
5. (20 pts) ΔH = -601 kJ/mol of MgO for the formation of MgO for the following reaction:
2Mg + O2 → 2MgO
a. Is the reaction exothermic or endothermic.
b. Is Heat energy given off or absorbed.
c. How much Heat is given off or absorbed if 3.5 moles of MgO is formed ?(be sure to use the proper sign with your answer and pay attention to your units)
 
6. (30 pts) 165.0 mL of a 1.9M solution of CaCl2(aq) is reacted with 275.0 mL of 0.81M solution of Na3PO4(aq)
Given the reaction : 2Na3PO4(aq) + 3CaCl2(aq) → Ca3(PO4)2 (s)+6NaCl(aq)
a) Determine the mass of the precipitate Ca3(PO4)2 formed
b) Determine the concentration of NaCl in the solution after the reaction has occurred
c) Determine the concentration of Na3PO4 in the solution after the reaction has occurred
D)Determine the concentration of CaCl2 in the solution after the reaction has occurred
e) If the reaction actually yielded 21.4 g of Ca3(PO4)2 determine the percent yield of the reaction
 
(20 pts) Given the reaction:
Na2CO3(aq) +2HNO3(aq) → 2NaNO3(aq) +CO2(g) +H2O(l)
If it required exactly 82.53 ml of HNO3 to completely react with 25.0 mL of 0.38 M Na2CO3. Determine the concentration in Molarity (M) of the HNO3 solution used in the reaction (This is a titration problem)
 
 
8. (20 pts) Given the reaction:
3K2CO3 +2H3PO4(aq) → 2K3PO4(aq) +3CO2(g) +3H2O(l)
If it required 48.5 ml of H3PO4 to completely react with 1.264 g of K2CO3 Determine the concentration in Molarity (M)