객관식
How many molecules are present in 25 grams of NH_3?
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Mole Concept
객관식
How many moles are present in 2.5 g of N_2?
A
0.56 moles
B
0.18 moles
C
1.25 moles
D
0.089 moles
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검증된 단계별 안내1
Identify the given information: the mass of nitrogen gas (N\_2) is 2.5 grams.
Calculate the molar mass of N\_2 by adding the atomic masses of two nitrogen atoms. Since the atomic mass of nitrogen (N) is approximately 14.0 g/mol, the molar mass of N\_2 is calculated as \(14.0 \times 2\) g/mol.
Use the formula to find moles from mass: \(\text{moles} = \frac{\text{mass}}{\text{molar mass}}\).
Substitute the known values into the formula: \(\text{moles} = \frac{2.5}{28.0}\), where 28.0 g/mol is the molar mass of N\_2.
Perform the division to find the number of moles present in 2.5 g of N\_2.
