Part A Balance the following equation: K 2 CrO 4 +Na 2 SO 3 +HCl?KCl+Na 2 SO 4 +

Question

Part A

Balance the following equation:

K2CrO4+Na2SO3+HCl?KCl+Na2SO4+CrCl3+H2O

Generally coefficients of 1 are omitted from balanced chemical equations. When entering your answer, include coefficients of 1 as required for grading purposes.

Enter the coefficients for each compound, separated by commas, in the order in which they appear in the equation (e.g.,  1,2,3,4,5,6,7).

Part B

In the process of oxidizing I? to I2, SO42? is reduced to SO2. How many moles of SO2 are produced in the formation of one mole of I2?

Express your answer numerically in moles.

Explanation / Answer

A

2K2CrO4+3 Na2SO3 +10HCl ----> 4KCl+3 Na2SO4+2 CrCl3 + 5H2O

B-

2I ----->I2 + 2e [I losses 2 electron]

SO4    + 2e -----> SO2 + O2 [ SO4 take 2 e to form SO2]

+6 o.s                  +4o.s

so one mole of SO2 is formed in formation of 1 mole of I2

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