Question

Calculate total charge on 48 g of SO42– ion. (A) 1.6 × 10–19 C (B) 3.2 × 10–19 C (C) 4.8 × 10–19 C (D) 6.4 × 10–19 C​

Answer 1

Answer:

3.86×10 ^5C

Molar mass of Mg +2=24g

Given mass of Mg +2 =48g

No. of moles of Mg +2= Molar mass

Given mass = 24^48 =2 moles1 mole of Mg +2= 2 moles of electrons

∴2 moles of Mg +2= 4 moles of electrons

∴ No. of electrons = no. of moles of electronsAvogadro's constant

⇒ No. of electrons =4×6.023×10 ^23 =2.4×10 ^24

As we know that,

Charge on 1 electron =1.6×10 −19 C

∴ Total charge on 48 g Mg +2

=no. of e − s×charge on 1 e −

=(2.4×10 ^24 )×(1.6×10 −19 )=3.84×10 ^5

C≈3.86×10 ^5C

Hence, the correct answer is 3.86×10^5C.

Explanation:

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