객관식
If you have 267 grams of aluminum chloride (AlCl_3), how many moles of AlCl_3 do you have?
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2. Atoms & Elements
Mole Concept
Multiple Choice
How many moles are present in 7.5 × 10^{19} molecules of ammonia (NH_3)?
A
1.25 × 10^{-4} mol
B
7.5 × 10^{-19} mol
C
4.52 × 10^{-5} mol
D
6.02 × 10^{23} mol
검증된 단계별 안내1
Identify the given quantity: 7.5 \(\times\) 10^{19} molecules of ammonia (NH_3).
Recall that 1 mole of any substance contains Avogadro's number of molecules, which is approximately 6.022 \(\times\) 10^{23} molecules/mol.
Set up the conversion to find moles from molecules using the formula: \(\text{moles} = \frac{\text{number of molecules}}{\text{Avogadro's number}}\).
Substitute the given values into the formula: \(\text{moles} = \frac{7.5 \times 10^{19}}{6.022 \times 10^{23}}\).
Perform the division of the coefficients and subtract the exponents in the powers of ten to express the answer in scientific notation.
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