Question

1. 2 NH3 + 3 CuO g 3 Cu + N2 + 3 H2O In the above equation how many moles of water can be made when 36 moles of NH3 are consumed?

2. 3 Cu + 8HNO3 g 3 Cu(NO3)2 + 2 NO + 4 H2O

In the above equation how many moles of NO can be made when 86 moles of HNO3 are consumed?

3. 3 Cu + 8HNO3 --> 3 Cu(NO3)2 + 2 NO + 4 H2O

In the above equation how many moles of water can be made when 82 moles of HNO3 are consumed?


Sodium chlorate decomposes into sodium chloride and oxygen gas as seen in the equation below.

4. ­­2NaClO3­ --> 2NaCl +3O2

How many moles of NaClO3­ were needed to produce 56 moles of O2? Round your answer to the nearest whole number.

Answer 1

1. 36 moles NH3 - ? moles H20
First we find the number of moles for HN3 which is 1 before multiplying it times the number before the element which is 2.
We then find the moles for H20 which is 1 before multiplying it times the number before the element which is 3. We now have 3 numbers. 36 moles NH3, 2 moles NH3, and 3 moles H20. We then cross multiple the moles of NH3 which is 36 with the moles for NH3 which is 3 making it 108 before dividing it by two which gives us 54 moles H20 as our answer.

2. 86 moles HNO3 - ? moles NO
We first find the moles for HNO3 which is 1 before multiplying it with the number in front of it which is 8. We soon find the miles for NO which is 1 before multiplying it with 2. We then cross multiply We soon multiply 86 with 2 which leads to 172 before divide by 8 which leads us with 21.5 moles NO.

3. 82 moles HNO3 - ? moles H2O
We find the moles for HNO3 which is 1 and multiply it by 8. We then get the moles for H20 which is 1 before multiplying it by 4. When then cross multiply 82 with 4 which is 328 before dividing it by 8 which leaves us with 41 moles H2O.

4. 56 moles O2 - ? moles NaClO3
We find the moles for O2 which is 1 before multiplying it with 3. We then find the moles for NaClO3 which is 1 before multiplying it with 2. We The cross multiply 56 with 2 to get 112 before dividing it by 3 which gives us 37.33 which rounds to 37 miles NaClO3.