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Chapter 7: Q. 7.96 (page 255)

How many moles are in $4.00$ gof each of the following compounds? ( $7.3$ )
a. ${NH}_{3}$
b. $Ca {({NO}_{3})}_{2}$
c. ${SO}_{3}$

Short Answer

Expert verified

(a) The no. of moles of ${NH}_{3}$ in localid="1653468385200">4.00gare localid="1653468399534" $0.235$ mole

(b) The no. of moles of $Ca {({NO}_{3})}_{2}$ in localid="1653468422965" $4.00$ gare localid="1653468436007">0.024mole

(c) The no. of moles of ${SO}_{3}$ inlocalid="1653468450392" $4.00$ gare localid="1653468463717" $0.05$ mole

Step by step solution

01

Part (a) Step 1: Given information

We need to find no. of moles in given compound i.e. $N H_{3}$

02

Part (a) Step 2: Explanation

We know that

Molar mass of ${NH}_{3}$ is localid="1653484364686" $17 g / mole$

And molar mass is equal to a mole

Therefore,

localid="1653484377668" $17 g = 1 mole 4.00 g = \frac{1 mole}{17 g} 脳 4 g = 0.235 mole$

03

Part (b) Step 1: Given information

We need to find no. of moles in given compound i.e. $Ca {({NO}_{3})}_{2}$

04

Part (b) Step 2: Explanation

We know that

Molar mass of $Ca {({NO}_{3})}_{2}$ islocalid="1653484404438" $164 g / mole$

And molar mass is equal to a mole

Therefore,

localid="1653484416853" $164 g = 1 mole 4.00 g = \frac{1 mole}{164 g} 脳 4 g = 0.024 mole$

05

Part (c) Step 1: Given information

We need to find no. of moles in given compound i.e. ${SO}_{3}$

06

Part (c) Step 2: Explanation

We know that

Molar mass of ${SO}_{3}$ is localid="1653484445634" $80 g / mole$

And molar mass is equal to a mole

Therefore,

localid="1653484459957" $80 g = 1 mole 4.00 g = \frac{1 mole}{80 g} 脳 4.00 g = 0.05 mole$

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Most popular questions from this chapter

A toothpaste contains $0.240 %$ by mass sodium fluoride used to prevent dental caries and $5.0 %$ by mass ${KNO}_{3}$ , which decreases pain sensitivity. One tube contains $119 g$ of toothpaste
role="math" localid="1652503120563" $NaF$ and ${KNO}_{3}$ are components found in toothpastes.

How many moles of $NaF$ are in the tube of toothpaste?
How many fluoride ions, $F^{-}$ , are in the tube of toothpaste?
How many grams of sodium ion, ${Na}^{+}$ , are in $1.50 g$ of toothpaste?
How many ${KNO}_{3}$ formula units are in the tube of toothpaste?

Calculate the molar mass for each of the following:

a. $KCl$ , salt substitute

b. $C_{6} H_{5} {NO}_{2}$ , niacin (vitamin $B 3$ ) needed for cell metabolism

c. $C_{19} H_{20} {FNO}_{3}$ , Paxil, antidepressant

The equation for the formation of silicon tetrachloride from silicon and chlorine is ( $7.9$ )

data-custom-editor="chemistry" $Si (s) + 2 {Cl}_{2} (g) 鈫� {SiCl}_{4} (g) + 157 kcal$

a. Is the formation of data-custom-editor="chemistry" ${SiCl}_{4}$ , an endothermic or exothermic reaction?

b. Is the energy of the product higher or lower than the energy of the reactants?

Calculate the mass, in grams, for each of the following:

a. $1.50$ moles of $N a$

b. $2.80$ moles of $C a$

c. $0.125$ mole of $C O_{2}$

d. $0.0485$ mole of $N a_{2} C O_{3}$

e. $7.14 x 10^{2}$ moles of $P C I_{3}$

Calculate the molar mass for each of the following: ( $7.2$ )

a. data-custom-editor="chemistry" ${MgCO}_{3}$ , magnesium carbonate, used in antacids

b. data-custom-editor="chemistry" $Au {(OH)}_{3}$ , gold(III) hydroxide, used in gold plating

c. data-custom-editor="chemistry" $C_{18} H_{34} O_{2}$ , oleic acid, from olive oil

d. data-custom-editor="chemistry" $C_{21} H_{26} O_{5}$ ,prednisone, anti-inflammatory

See all solutions

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