Stoichiometry grams to grams

​Page 87

Multiple Choice

For the Balanced Reaction: 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe; What is the Ratio of moles of MgO to moles Fe?

• 3mol Mg / 2 mol Fe
• 2 mol Mg/ 3 mol Fe
• 1 mol Fe/ 2 mol Fe
• 3 mol MgO / 2 mol Fe

Multiple Choice

2H₂  +   O₂  →  2H₂O
How many moles of oxygen are consumed if 8 moles H₂ are used?

• 2
• 4
• 6
• 8

Grams to Grams differences

You can't convert from grams of one substance to another directly.
You have to convert to moles first as every chemical formula is written in moles!

Dropdown

Fill in the steps required to find the number of grams of substance B produced from the number of grams of substance A:

grams of A x ​​​

Select answer

x  ​

Select answer

x ​

Select answer

 = grams of B.

Multiple Choice

              For the reaction represented by the equation $$N_2+3H_{2\ }\rightarrow\ 2NH_3$$  , how many moles of nitrogen (N2) are required to produce 18 grams of ammonia (NH3)?

• 0.9 mol

• 18 grams

• 0.53 mol

• 36 grams

Multiple Choice

For the reaction represented by the equation $$Pb\left(NO_3\right)_2+2KI\ \rightarrow\ PbI_2+2KNO_3$$  how many moles of lead iodide $$\left(PbI_2\right)$$ are produced of 300 grams potassium iodide $$\left(KI\right)$$  when $$Pb\left(NO_3\right)_2$$  is in excess?

• 114.78 mol PbI₂

• 0.904 grams PbI₂

• 0.904 mol PbI₂

• 114.78 grams PbI₂

Multiple Choice

For the reaction represented by the equation $$2KClO_3\rightarrow\ 2KCI+30_2$$  how many grams of potassium chlorate are required to produce 160. g of oxygen?

• 408 g KClO₃

• 804 g KClO₃

• 598 g KClO₃

• There is not enough information.