Question

if a sample has 0.4578 moles of calcium chloride, how many formula units are in the sample? 2.757e23 for. unt. cacl2 2.757e24 7.602e21 7.602e - 25

Explanation:

Step1: Recall Avogadro's number

Avogadro's number \( N_A=6.022\times 10^{23}\text{ formula units/mol}\)

Step2: Use the formula \(N = n\times N_A\)

Given \(n = 0.4578\space mol\) of \(CaCl_2\). Then \(N=0.4578\times6.022\times 10^{23}\)

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Answer:

A. \(2.757E23\) for. unt. \(CaCl2\)