Multiple Choice
In the mole concept, how many copper atoms are present in of copper (Cu)?
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2. Atoms & Elements
Mole Concept
Multiple Choice
Calculate the number of oxygen atoms found in 783.9 g NiCl2 • 6 H2O.
A
1.192 x 1025 O atoms
B
2.314 x 1025 O atoms
C
5.833 x 1026 O atoms
D
8.849 x 1026 O atoms
Verified step by step guidance1
First, determine the molar mass of NiCl2 • 6 H2O. Calculate the molar mass by adding the atomic masses of all atoms in the compound: Ni, Cl, H, and O. Use the periodic table to find these values.
Next, convert the given mass of NiCl2 • 6 H2O (783.9 g) to moles using the formula: \( \text{moles} = \frac{\text{mass}}{\text{molar mass}} \). This will give you the number of moles of the compound.
Since NiCl2 • 6 H2O contains 6 water molecules, each water molecule has 1 oxygen atom. Therefore, there are 6 oxygen atoms per formula unit of NiCl2 • 6 H2O. Multiply the moles of NiCl2 • 6 H2O by 6 to find the moles of oxygen atoms.
Convert the moles of oxygen atoms to the number of oxygen atoms using Avogadro's number (\(6.022 \times 10^{23}\) atoms/mol). Use the formula: \( \text{number of atoms} = \text{moles} \times \text{Avogadro's number} \).
Finally, compare your calculated number of oxygen atoms to the given options to identify the correct answer.
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