##### Calculate number of moles in the given number of atoms.

##### Titanium is corrosion resistant metal that is used in rockets, aircrafts, and jet engines. Calculate the number of moles of this metal in a sample containing 3.011 x 10^{23} Ti atoms.

Difficulty: Hard

**Problem solving strategy: **

Remember that 1 mole of an element contains 6.022x 10^{23 }atoms

**Solution:**

6.022 x 10^{23} Ti atoms = 1 mole of Ti

1 Ti atom = $\frac{1}{6.022 \times 10^{23}}$ moles of Ti

3.011 x 10^{23} Ti atoms = $\frac{1}{6.022 \times 10^{23}} \times 3.011 \times 10^{23}$ moles of Ti

**3.011 x 10 ^{23} Ti atoms = 0.5 moles of Ti**