객관식
How many moles of carbon dioxide are contained in 4.66 x 10^26 molecules?
1000
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2. Atoms & Elements
Mole Concept
객관식
What is the mass of one molecule of NH₃ in grams?
A
1.50 x 10^-23 grams
B
4.50 x 10^-23 grams
C
3.40 x 10^-23 grams
D
2.82 x 10^-23 grams
검증된 단계별 안내1
First, understand that the problem requires calculating the mass of a single molecule of NH₃ (ammonia) in grams. To do this, we need to use the molar mass of NH₃ and Avogadro's number.
Calculate the molar mass of NH₃. NH₃ consists of one nitrogen (N) atom and three hydrogen (H) atoms. Use the atomic masses: nitrogen is approximately 14.01 g/mol and hydrogen is approximately 1.01 g/mol. The molar mass of NH₃ is calculated as: .
Once you have the molar mass of NH₃, use Avogadro's number, which is molecules/mol, to find the mass of one molecule. The mass of one molecule is the molar mass divided by Avogadro's number.
Set up the equation to find the mass of one molecule: . Substitute the values you calculated for the molar mass and Avogadro's number.
Perform the division to find the mass of one molecule of NH₃ in grams. This will give you the mass of a single NH₃ molecule, which should match one of the provided options.
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