Calcium nitrate tetrahydrate is written as Ca(NO3)2.4H2O, which means that it contains one mole of calcium nitrate (Ca(NO3)2) and four moles of water (4H2O).
Since we know that the compound contains 0.44 moles of calcium nitrate, we can use the coefficient of the water in the chemical formula to find out how many moles of water the compound contains. The coefficient of water in the chemical formula is 4, so we can use it to calculate the number of moles of water in the compound:
0.44 moles of calcium nitrate x 4 moles of water/1 mole of calcium nitrate = 1.76 moles of water.
So the compound contains 1.76 moles of water.