Mass calculation and Theoretical yield help?

Calculate the mass of potassium dichromate (K2Cr2O7) required to produce 1.0 g of iodine (I2) according to the equation below: K2Cr2O7 + 6NaI + 7H2SO4 à Cr2 (SO4)3 + 3I2 + 7H2O + 3Na2SO4 + K2SO4 I already balanced it two--Calculate the theoretical yield percentage of a reaction between sodium and water, if... show more Calculate the mass of potassium dichromate (K2Cr2O7) required to produce 1.0 g of iodine (I2) according to the equation below:

K2Cr2O7 + 6NaI + 7H2SO4 à Cr2 (SO4)3 + 3I2 + 7H2O + 3Na2SO4 + K2SO4
I already balanced it

two--Calculate the theoretical yield percentage of a reaction between sodium and water, if 25.0 g of sodium react with excess water and if 15.5 L of gaseous hydrogen are collected at NTP conditions
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