4. If I weighed out 0.420 grams of B (boron), how many moles do I have?
5. How many grams of Pb (lead) do I need to mass out to obtain 2.543 moles of Pb?
6. If I have weighed out 0.0453 kilograms of Na (sodium), how many moles of Na do I have?
Answer: 1)211g Zn 2)8.0g S 3)0.579mole Fe
4) 0.0382 mole B 5) 526.4g Pb 6) 1.97 mole Na