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Chapter 7: Q. 7.93 (page 255)

How many grams are in $0.150$ moleof each of the following? ( $7.3$ )
a. $K$
b. ${Cl}_{2}$
c. $N a_{2} C O_{3}$

Short Answer

Expert verified

(a) The mass of $K$ in localid="1653465720314" $0.150$ moleis localid="1653465731820" $5.87$ g

(b) The mass of $C l_{2}$ in localid="1653465747900">0.150moleis localid="1653465893353" role="math" $10.6$ g

(c) The mass of ${Na}_{2} {CO}_{3}$ in localid="1653465933393" $0.150$ moleis localid="1653465947867" $15.9$ g

Step by step solution

01

Part (a) Step 1: Given information

We need to find the mass of given element i.e. $K$

02

Part (a) Step 2: Explanation

We know that

Molar mass of $K$ is localid="1653483743125" $39 g / mole$

And a mole of the element is equal to molar mass

Therefore,

localid="1653483757545" $1 mole = 39 g 0.15 mole = \frac{39 g 脳 0.150 mole}{mole} = 5.87 g$

03

Part (b) Step 1: Given information

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

04

Part (b) Step 2: Explanation

We know that

Molar mass of ${Cl}_{2}$ islocalid="1653483785033" $71 g / mole$

And a mole of the element is equal to molar mass

Therefore,

localid="1653483798412" $1 mole = 71 g 0.150 mole = \frac{71 g 脳 0.150 mol}{mol} = 10.6 g$

05

Part (c) Step 1: Given information

We need to find the mass of given compound i.e. ${Na}_{2} {CO}_{3}$

06

Part (c) Step 2: Explanation

We know that

Molar mass of ${Na}_{2} {CO}_{3}$ islocalid="1653483821807" $106 g / mole$

And a mole of the element is equal to molar mass

Therefore,

localid="1653483833462" $1 mole = 106 g 0.150 mole = \frac{106 g 脳 0.150 mol}{mol} = 15.9 g$

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Most popular questions from this chapter

Calculate the molar mass for each of the following:

a. ${FeSO}_{4}$ , iron supplement

b. ${Al}_{2} O_{3}$ , absorbent and abrasive

c. $C_{7} H_{5} {NO}_{3} S$ , saccharin, artificial sweetener

If green sphere represents the chlorine atoms and red sphere represents the oxygen atoms and all are gases.

Write the formula for each of the reactants and products.
Write the balanced equation.
Indicate the type of reaction as combination, decomposition, single replacement, double replacement, or combustion.

When solid lead(II) sulfide reacts with oxygen gas, the products are solid lead(II) oxide and sulfur dioxide gas.

a. Write the balanced chemical equation for the reaction.

b. How many grams of oxygen are required to react with $29.9 g$ of lead(II) sulfide?

c. How many grams of sulfur dioxide can be produced when $65.0 g$ of lead(II) sulfide reacts?

d. How many grams of lead(II) sulfide are used to produce $128 g$ of lead(II) oxide?

Dinitrogen oxide (or nitrous oxide), $N_{2} O$ , also known as laughing gas, is widely used as an anesthetic in dentistry.

a. How many grams are in localid="1653463981976">1.50molesof dinitrogen oxide?

b. How many moles are in localid="1653463992855" $34.0$ gof dinitrogen oxide?

Calcium cyanamide, $C a C N_{2}$ reacts with water to form calcium carbonate and ammonia.

$C a C N_{2} (s) + 3 H_{2} O (l) 鈫� C a C O_{3} (s) + 2 N H_{3} (g)$

a. How many grams of $H_{2} O$ are needed to react with localid="1653494390919" $75.0 g$ of $C a C N_{2} ?$

b. How many grams of $N H_{3}$ are produced from localid="1653494416163" $5.24 g$ of $C a C N_{2} ?$

c. How many grams of $C a C O_{3}$ form iflocalid="1653494442688" $155 g$ of $H_{2} O$ reacts?

See all solutions

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