Multiple Choice
How many molecules of CH4 are present in 43.2 grams of methane (CH4)?
2. Atoms & Elements
Mole Concept
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How many moles of sodium carbonate (Na2CO3) contain 1.773 × 10^17 carbon atoms?
A
1.18 × 10^-6 moles
B
2.95 × 10^-7 moles
C
8.85 × 10^-7 moles
D
5.90 × 10^-7 moles
Verified step by step guidance1
Identify the relationship between moles of sodium carbonate (Na2CO3) and carbon atoms. Each molecule of Na2CO3 contains one carbon atom.
Use Avogadro's number, which is 6.022 × 10^23 atoms/mole, to find the number of moles of carbon atoms. Set up the conversion factor: (1 mole of carbon atoms / 6.022 × 10^23 carbon atoms).
Calculate the moles of carbon atoms by multiplying the given number of carbon atoms (1.773 × 10^17) by the conversion factor from the previous step.
Since each molecule of Na2CO3 contains one carbon atom, the moles of Na2CO3 will be equal to the moles of carbon atoms calculated.
Compare the calculated moles of Na2CO3 with the given options to determine the correct answer.
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