Question

calculate the molar mass of:-

Na2Co3.10H2O

CaCl2

H2SO4

Al2(SO4)3

Cu(NO3)2

Answer 1

hello

▶ Molar mass of Na2CO3.10H2O

▶▶▶Atomic weights: Na - 23 C - 12 O - 16 H2O - 18
molar mass of Na2CO3.10H2O is

(2*23) + (1*12) + (3*16) + (10*1) + (10*18)

= 46 + 12 + 48 + 10 + 180

= 296

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▶Molar mass of CaCl2

▶▶▶Atomic weights: Ca - 40 Cl - 35.5

molar mass of CaCl2 is

(1*40) + (2*35.5)

= 40 + 71

= 111

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▶Molar mass of  H2SO4

▶▶▶Atomic weights: H - 1 S - 32 O - 16

molar mass of H2SO4 is

(2*1) + (1*32) + (4*16)

= 2 + 32 + 64

= 98

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▶Molar mass of Al2(SO4)3

▶▶▶Atomic weights: Al - 27 S - 32 O -16

molar mass of Al2(SO4)3 is

(2*27) + 3[(1*32) + (4*16)]

= 54 + 3 (32 + 64)

= 54 + 288

= 342

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▶Molar mass of Cu(NO3)2

▶▶▶Atomic weights: Cu - 63.5 N - 14 O - 16

molar mass of Cu(NO3)2 is

(1*63.5) + 2[(1*14) + (3*16)]

= 63.5 + 2(14 + 48)

= 63.5 + 124

= 187.5

thank you

Answer 2

$\huge\mathfrak\red{Answer :}$


1) Molar mass of Na2CO3.10H2O

Atomic weights:

Na :- 23

C :- 12

O :- 16

H2O :- 18

So, Molar mass of Na2CO3.10H2O is

= (2 × 23) + (1 × 12) + (3 × 16) + (10 × 1) + (10 × 18)

= 46 + 12 + 48 + 10 + 180

= 296 g/mol.

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2) Molar mass of CaCl2

Atomic weights:

Ca :- 40

Cl :- 35.5

Molar Mass of CaCl2 is

= (1 × 40) + (2 × 35.5)

= 40 + 71

= 111 g/mol.

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3) Molar mass of  H2SO4

Atomic weights:

H :- 1

S :- 32

O :- 16

Molar Mass of H2SO4 is

= (2 × 1) + (1 × 32) + (4 × 16)

= 2 + 32 + 64

= 98 g/mol.

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4) Molar mass of Al2(SO4)3

Atomic weights:

Al :- 27

S :- 32

O :- 16

Molar Mass of Al2(SO4)3 is

= (2 × 27) + 3[(1 × 32) + (4 × 16)]

= 54 + 3 (32 + 64)

= 54 + 288

= 342 g/mol.

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5) Molar mass of Cu(NO3)2

Atomic weights:

Cu :- 63.5

N :- 14

O :- 16

Molar Mass of Cu(NO3)2 is

= (1 × 63.5) + 2[(1 × 14) + (3 × 16)]

= 63.5 + 2(14 + 48)

= 63.5 + 124

= 187.5 g/mol.

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