Microsoft Word non-commer to chiometry Lab handout tReadOnM [Compatibility Model

Question

Microsoft Word non-commer to chiometry Lab handout tReadOnM [Compatibility Model . . . E . L Emphasis Heading! | : ' Normal Strong Paragraph Styles Equations and mole-to-mole relationships 7. The concepts of Stoichiometry are familiar to those who cook in the kitchen. For example, suppose the recipe for pizza is: l aust + Soztomato sauce+ 2 cups cheese 1 pizza This recipe shows the numerical relationships between the pizza ingredients. Show your calculations for determining the number of pizzas you could make if you have 6 cups of cheese and enough of the other ingredients. 8. For the following reaction: -Cr(s) + 3O2(g) 2Cr2O3(s) Starting with 10.4g of O2, how many moles of Cr2O; can be produced How many grams of Cr metal would be needed to fully react with 10 4g oxygen?

Explanation / Answer

Q7

if we have 6 cups of cheese

clearly

we need 2 cups per pizza

2cups/pizza

so

6cups * pizza / 2cups = 3 pizza max.

Q8

m = 10.4 g of O2

mol = mass/MW = 10.4/32 =0.325 mol of O2

ratio is

3 mol of O2 = 2 mol of Cr2O3

0.325 mol --> 2/3*0.325 = 0.21666 mol of Cr2O3

b)

mol of Cr required

4 mol of Cr = 3 mol of O2

x mol of Cr = 0.325 mol of O2

x = 0.325 *4/3

x = 0.4333 mol of Cr

mass = mol*MW = 0.4333*51.99610 = 22.529 g of Cr

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