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Chapter 7: Q. 7.94 (page 255)

How many grams are in $2.25$ moleof each of the following? ( $7.3$ )
a. $N_{2}$
b. $NaBr$
c. $C_{6} H_{14}$

Short Answer

Expert verified

(a) The mass of $N_{2}$ in localid="1653466794208" $2.25$ mole is localid="1653466823234" $63$ g

(b) The mass of $NaBr$ in localid="1653466807183" $2.25$ mole is localid="1653466832888" $231.75$ g

(c) The mass of $C_{6} H_{14}$ inlocalid="1653466849324" $2.25$ moleis localid="1653466863496" $193.5$ g

Step by step solution

01

Part (a) Step 1: Given information

We need to find the mass of given compound i.e. $N_{2}$

02

Part (a) Step 2: Explanation

We know that

The molar mass of $N_{2}$ islocalid="1653483910923" $28 g / mole$

And a mole of the element is equal to molar mass

Therefore,

localid="1653483920741" $1 mole = 28 g 2.25 mole = \frac{28 g 脳 2.25 mol}{mol} = 63 g$

03

Part (b) Step 1: Given information

We need to find the mass of given compound i.e. $NaBr$

04

Part (b) Step 2: Explanation

We know that

The molar mass of $NaBr$ islocalid="1653483947784" $103 g / mole$

And a mole of the element is equal to molar mass

Therefore,

localid="1653483936659" $1 mole = 103 g 2.25 mole = \frac{103 g 脳 2.25 mol}{mol} = 231.75 g$

05

Part (c) Step 1: Given information

We need to find the mass of given compound i.e. $C_{6} H_{14}$

06

Part (c) Step 2: Explanation

We know that

The molar mass of $C_{6} H_{14}$ islocalid="1653483966230" $86 g / mole$

And a mole of the element is equal to molar mass

Therefore,

localid="1653484006578" $1 mole = 86 g 2.25 mole = \frac{86 g 脳 2.25 mol}{mol} = 193.5 g$

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Most popular questions from this chapter

Calculate the number of moles in each of the following:

a. $85.2$ gof $N i$

b. localid="1653463313267" $144$ gof $K$

c. localid="1653463322209" $6.4$ gof $H_{2} O$

d. localid="1653463332032" $308$ gof $B a S O_{4}$

e.localid="1653463342745" $252.8$ gof fructose, $C_{6} H_{12} O_{6}$

Liquid methanol ${CH}_{4} O$ , which is used as a cooking fuel, burns with oxygen gas to produce the gases carbon dioxide and water. The reaction produces $363 kJ$ of heat per mole of methanol.
a. Write a balanced equation for the reaction, including the heat of reaction.
b. Is the reaction endothermic or exothermic?
c. How many moles of $O_{2}$ must react with $0.450$ mole of ${CH}_{4} O$
d. How many grams of ${CO}_{2}$ are produced when $78.0 g$ of ${CH}_{4} O$ reacts?

Identify the type of reaction for each of the following as combination, decomposition, single replacement, double replacement, or combustion: ( $7.5$ )

a. A compound breaks apart into its elements.

b. Copper and bromine form copper( $I I$ ) bromide.

c. Iron( $I I$ ) sulfite breaks down to iron( $I I$ ) oxide and sulfur dioxide.

d. Silver ion from data-custom-editor="chemistry" ${AgNO}_{3}$ (aq.) forms a solid with bromide ion from data-custom-editor="chemistry" $KBr$ (aq).

Ammonia and oxygen react to form nitrogen and water.

$4 N H_{3} (g) + 3 O_{2} (g) 鈫� 2 N_{2} (g) + 6 H_{2} O (g)$

a. How many grams of $O_{2}$ are needed to react withlocalid="1653487157133" $13.6 g$ of $N H_{3} ?$

b. How many grams of $N_{2}$ can be produced whenlocalid="1653487174328" $6.50 g$ of $O_{2}$ reacts?

c. How many grams of $H_{2} O$ are formed from the reaction of localid="1653487189643" $34.0 g$ of $N H_{3} ?$

Calculate the molar mass for each of the following:

a. ${Al}_{2} {({SO}_{4})}_{3}$ , antiperspirant

b. ${KC}_{4} H_{5} O_{6}$ ,cream of tartar

C. $C_{16} H_{19} N_{3} O_{5} S$ ,amoxicillin, antibiotic

See all solutions

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