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Chapter 3: Q.17E (page 129)

Determine the mass of each of the following:

(a) 0.0146 mol KOH

(b) 10.2 mol ethane, C2H6

(c) 1.6脳10鈭�3 mol Na2SO4

(d) 6.854脳103 mol glucose, C6 H12 O6

(e) 2.86 mol Co(NH3)6Cl3

Short Answer

Expert verified

(a) 0.0146 mol KOH = 0.7592 g

(b) 10.2 mol ethane, C2H6 = 306 g

(c) 1.6 脳 10鈭�3 mol Na2 SO4= 0.224 g

(d) 6.854脳103 mol glucose, C6 H12 O6 = 1.233 x 106g

(e) 2.86 mol Co (NH3)6Cl3 = 757.9 g

Step by step solution

01

Determining mass of KOH

Given: mol of compounds

To determine the mass of compound the formula is

Number of moles = Wt. in gram/Molecular weight

Wt. in gram = mass

First, we have to determine the molecular weight of the given compounds as follows.

Molecular weight of KOH = 39 + 12 + 1 = 52 g/mol

By using the following formula, we can calculate mass.

Mass = Number of moles x Molecular weight

(a) 0.0146 mol x 52 g/mol = 0.7592 g KOH

02

Determining mass of C2H6

Given: mol of compounds

To determine the mass of compound the formula is

Number of moles = Wt. in gram/Molecular weight

Wt. in gram = mass

First, we have to determine the molecular weight of the given compounds as follows.

Molecular weight of C2H6

= (2 x 12) + (6 x 1)

= 30 g/mol

By using the following formula, we can calculate mass.

Mass = Number of moles x Molecular weight

(b) 10.2 mol x 30 g /mol = 306 g C2H6

03

Determining mass of Na2SO4

Given: mol of compounds

To determine the mass of compound the formula is

Number of moles = Wt. in gram/Molecular weight

Wt. in gram = mass

First, we have to determine the molecular weight of the given compounds as follows.

Molecular weight of Na2 SO4

= (2 x 22) + 32 + (4 x 16)

= 140 g/mol

By using the following formula, we can calculate mass.

Mass = Number of moles x Molecular weight

(c) 1.6 脳 10鈭�3 mol x 140 g/mol = 0.224 g Na2SO4

04

Determining mass of C6H12O6

Given: mol of compounds

To determine the mass of compound the formula is

Number of moles = Wt. in gram/Molecular weight

Wt. in gram = mass

First, we have to determine the molecular weight of the given compounds as follows.

Molecular weight of C6H12O6

= (6 x12) + (12 x 1) + (6 x 16)

= 180 g/mol

By using the following formula, we can calculate mass.

Mass = Number of moles x Molecular weight

(d) 6.854脳103 mol x 180 g/mol = 1.233 x 106 g C6H12O6

05

Determine mass of Co(NH3)6Cl3

Given: mol of compounds

To determine the mass of compound the formula is

Number of moles = Wt. in gram/Molecular weight

Wt. in gram = mass

First, we have to determine the molecular weight of the given compounds as follows.

Molecular weight of Co(NH3)6Cl3

= 58 + (6 x 14) + (18 x 1) + (3 x 35)

= 265 g/mol

By using the following formula, we can calculate mass.

Mass = Number of moles x Molecular weight

e) 2.86 mol x 265 g/mol = 757.9 g

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