Question

How many moles of electrons are added when 2.5 mole Cr2o7 2- reduced in Cr3+?

Answer 1

The moles of electrons are added when 2.5 mole Cr2o7 2- reduced in Cr3+ is -

• Firstly let's see the equation for it ,

• Cr2O7 2- + 14H+ + 6e —> 2Cr3+ + 7H2O

• By this we get to know that ,

For 1 mol of Cr2O7-2 6 e are added to reduced in

Cr+3 .

• So , for 2.5 mol the moles of electrons added are -

2.5*6 = 15 moles of electrons .

• The moles of electrons are added when 2.5 mole Cr2o7 2- reduced in Cr3+ is - 15 moles of electrons