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Chapter 7: Q. 7.80 (page 253)

Using the models of the molecules (black = C, white = H, yellow = S, red = O), determine each of the following for models of compounds $1 a n d 2$ :
(a). Molecular formula.
(b). Molar mass.
(c). No. of moles in localid="1653459240830" $10 g$ .

Short Answer

Expert verified

(a) Molecular formula of given compounds are $S O_{3} a n d C_{10} H_{8}$

(b) Molar mass of given compounds are $80 a n d 128$

(c) No of moles of given compounds are $0.125 a n d 0.078$

Step by step solution

01

Part (a) Step 1: Given Information

We need to find the molecular formula of given molecules.

02

Part (a) Step 2: Explanation

If we see the figures then we simply identify that

Molecular formula of $(1)$ is $S O_{3}$

Molecular formula of $(2)$ is $C_{10} H_{8}$

03

Part (b) Step 1: Given Information

We need to find the molar mass of given molecules.

04

Part (b) Step 2: Explanation

We know that the formula of

$S O_{3}$
$C_{10} H_{8}$

So the molar mass are $m_{1}$ and $m_{2}$ :

localid="1653501270556" $m_{1} = 32 + 16 脳 3 m_{1} = 80 amu m_{2} = 12 脳 10 + 8 m_{2} = 128 amu$

05

Part (c) Step 1: Given Information

We need to find no of moles present in $10 g$ .

06

Part (c) Step 2: Explanation

We are know that $m_{1} = 80, m_{2} = 128$

So let there are $n_{1}$ and $n_{2}$ moles are present in $10 g$ :

localid="1653501316024" $moles = \frac{weight in g}{molar mass} n_{1} = \frac{10 g}{80 amu} n_{1} = 0.125 mole n_{2} = \frac{10 g}{128 amu} n_{2} = 0.078 mole$

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Most popular questions from this chapter

Identify each of the following as an oxidation or a reduction:

a. $O_{2} (g) + 4 e^{-} 鈫� 2 O^{2 -} (aq)$

b. $Ag (s) 鈫� {Ag}^{+} (aq) + e^{-}$

c. ${Fe}^{3 +} (aq) + e^{-} 鈫� {Fe}^{2 +} (aq)$

d. $2 Br^{-} (aq) 鈫� Br 2 (l) + 2 e^{-}$

When ammonia ( ${NH}_{3}$ ) gas reacts with fluorine gas, the gaseous products are dinitrogen tetrafluoride ( $N_{2} F_{4}$ ) and hydrogen fluoride ( $HF$ ). ( $7.4, 7.7, 7.8$ )

a. Write the balanced chemical equation.

b. How many moles of each reactant are needed to produce localid="1653469855463" $4.00$ moleof $HF$ ?

c. How many grams of $F_{2}$ are needed to react with localid="1653469902894" $25.5$ gof ${NH}_{3}$ ?

d. How many grams of $N_{2} F_{4}$ can be produced when localid="1653469925977" $3.40$ gof ${NH}_{3}$ reacts?

Propane gas, $C_{3} H_{8}$ , undergoes combustion with oxygen gas to produce carbon dioxide and water gases. Propane has a density of $2.02 g / L$ at room temperature. ( $7.4, 7.8$ )

a. Write the balanced chemical equation.

b. How many grams of $H_{2} O$ form when $5.00 L$ of $C_{3} H_{8}$ reacts?

c. How many grams of $H_{2} O$ can be produced from the reaction of $100 g$ of $C_{3} H_{8}$ ?

During heavy exercise and workouts, lactic acid, $C_{3} H_{6} O_{3}$ , accumulates in the muscles where it can cause pain and soreness.

a. How many molecules are in $0.500$ mole of lactic acid?
b. How many atoms of $C$ are in $1.50$ moles of lactic acid?
c. How many moles of lactic acid contain $4.5 脳 10^{24}$ atoms of $O$ ?
d. What is the molar mass of lactic acid?

Determine whether each of the following chemical equations are balanced or not balanced:

a. $P C l_{3} (s) + C l_{2} (g) 鈫� P C l_{5} (s)$

b. $C O (g) + 2 H_{2} (g) 鈫� C H_{4} O (g)$

c. $2 K C l O_{3} (s) 鈫� 2 K C l (s) + O_{2} (g)$

d. $M g (s) + N_{2} (g) 鈫� M g_{3} N_{2} (s)$

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