How many moles of Io3 are present in a 100mL solution containing 1.390g of KIO3

To calculate the number of moles of Io3 present in a solution, you need to use the formula:

moles = mass / molar mass

The molar mass of KIO3 (potassium iodate) can be calculated by adding up the atomic masses of each element:

K (potassium) = 39.10 g/mol
I (iodine) = 126.90 g/mol
O (oxygen) = 16.00 g/mol (there are 3 oxygen atoms)

Molar mass of KIO3 = (39.10 g/mol) + (126.90 g/mol) + (16.00 g/mol * 3) = 214.00 g/mol

Now, you can substitute the values into the formula:

moles = 1.390 g / 214.00 g/mol

Dividing the mass by the molar mass, you can calculate the number of moles:

moles = 0.00649 moles of KIO3

Since 1 mole of KIO3 produces 1 mole of Io3 when it dissolves in solution, the number of moles of Io3 present in the solution is also 0.00649 moles.