Consider the balanced equation: 5A + 8B 8C + 4D How many moles of B are required

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Consider the balanced equation:

5A + 8B 8C + 4D

How many moles of B are required to produce 4 moles of D?

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Consider the new balanced equation:

2A + 1B 7C + 1D

How many moles of D are produced when 7 moles of C are produced?

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Consider the balanced equation:

3A + 3B 4C + 2D

How many moles of C can be produced from 6 moles of B?

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Consider the new balanced equation:

3A + 2B 7C + 2D

How many moles of A are required to react with 7 moles of B?

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Consider the balanced equation:

3A + 2B 9C + 3D

How many moles of C can be produced from 0.72 moles of B?

Help: Using balanced equations (review)

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Consider the new balanced equation:

4A + 4B 6C + 3D

How many moles of A are required to react with 0.69 moles of B?

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Consider the balanced equation:

2A + 5B 3C + D

8 mol A are mixed with 18 mol B at an elevated temperature. After 6 mol of A have reacted, how much B is left?

Help: Balanced equation yield

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Consider the balanced equation:

2A + 5B 3C + D

0.39 mol A are mixed with 1.12 mol B at an elevated temperature. After 0.25 mol of A are left, how much B is left? Hint given in feedback.

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Consider the balanced equation:

2A + 5B 3C + D

0.39 mol A are mixed with 1.07 mol B at an elevated temperature. After 0.22 mol of A are left, how much C is produced?

Explanation / Answer

1)

5A + 8B 8C + 4D

How many moles of B are required to produce 4 moles of D?

ratio of B:D --> 8:4 that is, we need 8 mol of B to produce 4 mol of D

2)

2A + 1B 7C + 1D

How many moles of D are produced when 7 moles of C are produced?

ratio is 7C:1D; therefore, w eneed 1 mol of D to produce 7 of C

3)

3A + 3B 4C + 2D

How many moles of C can be produced from 6 moles of B?

ratio is 3B:4C

then

4/3C: B

if we want 6 mol of C we need 1.5*3 = 4.5 mol of B

4)

3A + 2B 7C + 2D

How many moles of A are required to react with 7 moles of B?

ratio is 3:2

then 1.5 mol of A are needed for 1 mol fo B

therefore

1.5*7 = 10.5 mol of A

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