Question

Find the charge on 12g of CA2 plus ions in coulombs.
al 193096 C
(b) 93096 C
(0) 96500 C
(d) 45096C

Answer 1

Answer:

correct answer is Option c

Answer 2

The charge on  Ca⁺² ions is 57811.2 Coulombs.

Given:

The mass of Ca⁺² ion = 12 g

To Find:

The charge in coulombs.

Solution:

We know,

"no of moles, n = given mass/molecular mass"

                        = 12/40

                        = 0.3

The reaction of Ca to Ca⁺² is given as

      Ca -------> Ca⁺²  +  2e⁻

1 mol gives 2 e⁻

0.3 mol gives = 0.3 × 2

                       = 0.6e⁻

We are required to find the charge on 12g of Ca⁺² ions,

The charge on ions = no.of moles×no.of atoms×magnitude of the charge

n = 0.6mol, no of atoms = 6.022x10^23 atoms, The magnitude of the charge = 1.6*10^x19 C

Putting the above value in the formula, we get

The charge on Ca⁺² ions = 0.6x6.022x10^23x1.6*10^x19

                                        = 57811.2 Coulombs.

Hence, The charge on  Ca⁺² ions is 57811.2 Coulombs.

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