How many titanium atoms does it contain? titanium has a density of 4.50 g/cm3?

The calculation for this problem would be first determining the grams of titanium present in the material. You would know this by multiplying the volume of the material to the density of titanium which is 4.5 g/cm3. Then divide what you get to the molar mass of titanium and multiply it with the 6.022x1023. You would now get the amount of atoms it contains.