Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen:

$$

4 \mathrm{KNO}_{3}(s) \longrightarrow 2 \mathrm{K}_{2} \mathrm{O}(s)+2 \mathrm{N}_{2}(g)+5 \mathrm{O}_{2}(g)

$$

To produce 56.6 $\mathrm{kg}$ of oxygen, how many (a) moles of $\mathrm{KNO}_{3}$

and (b) grams of $\mathrm{KNO}_{3}$ must be heated?

## Discussion

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## Recommended Questions

Draw the substitution product that results when $CH_3CH_2CH_2CH_2Br$ reacts with each nucleophile.

a. $^-OH$

b. $^-SH$

c. $^-CN$

d. $^-OCH(CH_3)_2$

e. $^-C \equiv CH$

f. $H_2O$

g. $NH_3$

h. $Nal$

i. $NaN_3$

Write proofs in the form specified by your teacher (two-column form, paragraph form, or a list of key steps).

$\begin{array}{cl}{\text { Given: } \overline{D E}} & {\cong \overline{F G} ; \overline{G D} \cong \overline{E F}} \\ {} & {\angle H D E \text { and } \angle K F G \text { are rt. } \Delta \text { . }}\end{array}$

Prove: $\overline{D H} \cong \overline{F K}$

You react chemical $A$ with chemical $B$ to make one product. It takes 100 of $A$ to react completely with 20 $\mathrm{g}$ of $B$ . What is the mass of the product?

a. less than 10 g

b. between 20 and 100 g

c. between 100 and 120 g

d. exactly 120 g

e. more than 120 g