Question

How many molecules are in 48 grams of oxygen gas?

Answer 1

Answer:

The atomic weight of oxygen is 15.9994, so the atomic weight of O2 is 31.9988.

That means that a mole of oxygen is 31.9988 g

6.02 *10^23 molecules/mole * 1 mole / 31.9988 g * 48 g = 9.0303 * 10^19 molecules

Explanation:

Answer 2

Answer:

Since oxygen (O) has an atomic mass of 16 g, oxygen gas (O2) has a molecular mass of 2 x 16 = 32 g. We need to convert the given amount of oxygen gas to moles and this can be done by dividing the given mass by the molecular weight of oxygen gas. Hence, moles of oxygen gas = 48 g / 32 g/mole = 1.5 moles.

Explanation:

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