Question

Which of the following has the largest molar mass?


a)

calcium chlorate

b)

magnesium chlorate

c)

potassium chlorate

d)

magnesium perchlorate

e)

lithium perchlorate

Answer 1

Answer:

magnesium perchlorate==>223.206 g/mol

Explanation:

1. calcium chlorate==>206.98 g/mol
2. magnesium chlorate==>191.20
3. potassium chlorate==>122.55 g/mo
4. magnesium perchlorate==>223.206 g/mol
5. lithium perchlorate==>106.39 g/mol

Answer 2

Magnesium Perchlorate has the largest Molar mass. Hence option 'D' is correct.

• The molar mass of the compound is defined as the sum of the molar masses of all the components present in it.
• For calculating the molar mass of the compound, one must know its chemical formula and the molar masses of the components.

the compound, one must know its chemical formula and the molar masses of the components.

a). Calcium Chlorate--

Chemical formula = Ca(ClO3)2

Molar mass of Calcium (Ca) = 40

Molar mass of Chlorine (Cl) = 35.5

Molar mass of Oxygen (O) = 16

So, Molar mass of Calcium Chlorate =

$M = 40 + (35.5 + 16 \times 3) \times 2$

$M = 40 + (35.5 \times 2 + 48 \times 2)$

$M = 40 + (71 + 96)$

$M = 40 + 167$

$M = 207$

b). Magnesium Chlorate--

Chemical formula = Mg(ClO3)2

Molar mass of Magnesium (Mg) = 24

Molar mass of Chlorine (Cl) = 35.5

Molar mass of Oxygen (O) = 16

So, Molar mass of Magnesium Chlorate =

$M = 24 + (35.5 + 16 \times 3) \times 2$

$M = 24 + (35.5 \times 2 + 48 \times 2)$

$M = 24 + (71 + 96)$

$M = 24 + 167$

$M = 191$

c). Potassium Chlorate--

Chemical formula = K(ClO3)2

Molar mass of Potassium (K) = 39

Molar mass of Chlorine (Cl) = 35.5

Molar mass of Oxygen (O) = 16

Molar mass of Chlorate = 167 (calculated above)

So, Molar mass of Potassium Chlorate =

$M = 39 + 167$

$M = 206$

d). Magnesium Perchlorate--

Chemical formula = Mg(ClO4)

Molar mass of Magnesium (Mg) = 24

Molar mass of Chlorine (Cl) = 35.5

Molar mass of Oxygen (O) = 16

So, Molar mass of Magnesium Perchlorate =

$M = 24 + (35.5 + 16 \times 4) \times 2$

$M = 24 + (35.5 \times 2 + 64 \times 2)$

$M = 24 + (71 + 128)$

$M = 24 + 199$

$M = 223$

e). Lithium Perchlorate--

Chemical formula = LiClO4

Molar mass of Lithium (Li) = 7

Molar mass of Chlorine (Cl) = 35.5

Molar mass of Oxygen (O) = 16

Molar mass of Perchlorate = 199 (calculated)

So, Molar mass of Magnesium Perchlorate =

$M = 7 + 199$

$M = 206$

So, Magnesium Perchlorate has the largest Molar mass. Hence option 'D' is correct.

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