Final answer:
In 2 moles of magnesium sulfate (MgSO4), there are 8 moles of oxygen, as each mole of magnesium sulfate contains 4 moles of oxygen.
Step-by-step explanation:
The question asks to find the number of moles of oxygen in 2 moles of magnesium sulfate. Magnesium sulfate has the chemical formula MgSO4, so in one mole of magnesium sulfate, there is one mole of magnesium (Mg), one mole of sulfur (S), and four moles of oxygen (O). Since we are dealing with 2 moles of magnesium sulfate, we multiply the number of moles of each element by 2. For oxygen, this calculation looks like 4 moles of O per MgSO4 times 2 moles of MgSO4 which gives us a total of:
4 moles O/mole MgSO4 x 2 moles MgSO4 = 8 moles of O
Therefore, the correct answer is: C) Mole8.