We are asked to determine the number of oxygen (O) atoms present in a sample of calcium carbonate (CaCO3) which is measuring 2.505 in on each edge and has a density of 2.72 g/cm3.
We shall follow these steps to solve this problem:
Step 1: Determine the volume of the sample in cm3.
Step 2: Multiply the obtained mass of CaCO3 with the density and then the molar mass of CaCO3.
Step 3: Perform a mole-to-mole comparison between O and CaCO3 (3 mol O: 1 mol CaCO3).
Step 4: Multiply the obtained moles of O with the Avogadro's number (6.02×1023 atoms/mol) and get the number of O atoms present.
Consider a sample of calcium carbonate in the form of a cube measuring 2.505 in. on each edge.
If the sample has a density of 2.72 g/cm3 , how many oxygen atoms does it contain?
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What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Mole Concept concept. You can view video lessons to learn Mole Concept. Or if you need more Mole Concept practice, you can also practice Mole Concept practice problems.