Stoichiometry Worksheet

JUST NEED ANSWERS FOR THE PROBLEMS IN RED PLEASE!!!!!!!

Directions: You are strongly encouraged to print out this worksheet and work with paper & pencil and a calculator for these problems. Then, either scan in your completed worksheet or record your answers on this sheet and attach to it the drop box. You must show work for credit. There are 10 questions. SHOW THE SET-UP OF YOUR SOLUTION.

Example Problem 1. Use this balanced equation: 2 C2H6 + 7 O2 4 CO2 + 6 H2O.

Ex. How many grams of Water are produced when 10 grams of C2H6 is burned?

Set up the problem to go from the starting value to the ending value (what is given to what is needed).

Notice that the answer is 18 grams

Did you calculate? Did you get the right answer?

Use the following equation to answer questions 1-3: 2 C4H10 + 13 O2 8 CO2 + 10 H2O

1. How many moles of H2O are produced when 2 moles of C4H10 are burned?

2. How many moles of Oxygen are needed to completely burn 2 moles C4H10?

3. How moles of CO2 are produced when 2 moles C4H10 are completely burned?

Use the following equation to answer questions 4 & 5: 6 HCl + 2 Al 2 AlCl3 + 3 H2

4. How many moles of Aluminum are needed to produce 5 moles of AlCl3?

5. How many moles of HCl are needed to use up 1 mole of Al?

Use this equation to answer questions 6 & 7: 2 C4H10 + 13 O2 8 CO2 + 10 H2O

6. How many moles of O2 are needed when 12 moles of C4H10 react?

7. How many moles of CO2 are produced when 4.0 moles of C4H10 react?

Use this equation to answer question 8. 2 K + Br2 2 KBr

8. How many moles of KBr are produced from 2.45 g of K?

Use the following balanced equation to answer 9 & 10. 2 H2 + O2 2 H2O

9. How many grams of H2O are produced when 6.0 grams of O2 react?

10. How many moles of hydrogen (H2) are needed to react with 4.0 g of O2?