For nA = 2 mol and nB = 3 mol, what is the mole fraction xA?

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Prepare for the NANTeL Chemistry Certification and Engineering Fundamentals Test with multiple choice questions, detailed explanations, and key insights to boost your understanding and confidence. Ace your exam!

Multiple Choice

For nA = 2 mol and nB = 3 mol, what is the mole fraction xA?

Explanation:
Mole fractions describe the proportion of moles of each component in a mixture. For a mixture with two components, x_A is the number of moles of A divided by the total moles: x_A = n_A / (n_A + n_B). With n_A = 2 mol and n_B = 3 mol, the total is 5 mol, so x_A = 2 / 5 = 0.4. This means forty percent of the moles in the mixture are A. The other values correspond to different distributions: 0.50 would require A to be half of the total moles, 0.20 would require A to be one-fifth of the total, and 0.60 would require A to be three-fifths of the total.

Mole fractions describe the proportion of moles of each component in a mixture. For a mixture with two components, x_A is the number of moles of A divided by the total moles: x_A = n_A / (n_A + n_B).

With n_A = 2 mol and n_B = 3 mol, the total is 5 mol, so x_A = 2 / 5 = 0.4. This means forty percent of the moles in the mixture are A.

The other values correspond to different distributions: 0.50 would require A to be half of the total moles, 0.20 would require A to be one-fifth of the total, and 0.60 would require A to be three-fifths of the total.

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