sample questions 1.4

(answers are at the bottom)

1. If you have 6.022 x 1023 atoms of Germanium, how else can you express this number?

2. How much does 6.022 x 1023 atoms (one mole) of Germanium weigh?

3. What is the atomic weight of Polonium?

4. How many grams does one mole of Polonium weigh?

5. If I have 30.974 grams of Phosphorus, how many moles of this element do I possess?

6. If I have 21.622 grams of Boron, how many moles of it do I possess?

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ANSWERS

1. you can say you have one mole of Germanium.

2. 72.64 grams. Remember, if you look at the atomic weight of an element, this gives you the weight — in grams — of one mole of that element.

3. 208.982 atomic mass units.

4. 208.982 grams. The atomic weight reading not only tells us how much one single atom of Polonium weighs in atomic mass units, it also tells us how many grams 6.022 x 1023 atoms of Polonium are. It has a duel function. Don’t forget that.

5. One mole. I know this because the atomic weight of Phosphorus is 30.974 amu. This means 30.974 grams of Phosphorus is exactly how much one mole (6.022 x 1023 atoms) of this element weighs.

6. The atomic weight reading for Boron is 10.811. Meaning that the weight of one mole of Boron is 10.811 grams. If we divide 21.622 by 10.811 we get exactly 2. Therefore, we have exactly 2 moles of Boron.

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