객관식
Which of the following steps correctly converts 18.0 grams of water (H_2O) to the number of molecules?
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- 1. Intro to General Chemistry3h 46m
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2. Atoms & Elements
Mole Concept
Multiple Choice
How many moles are present in 2.3 grams of phosphorus (P)? (Atomic mass of P = 30.97 g/mol)
A
0.48 mol
B
0.15 mol
C
13.4 mol
D
0.074 mol
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검증된 단계별 안내1
Identify the given information: mass of phosphorus (P) is 2.3 grams, and the atomic mass of phosphorus is 30.97 g/mol.
Recall the formula to calculate moles from mass: \(\text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}}\).
Substitute the given values into the formula: \(\text{moles} = \frac{2.3}{30.97}\).
Perform the division to find the number of moles of phosphorus present.
Compare your calculated value with the provided options to confirm the correct answer.
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