Multiple Choice
How many carbon atoms are present in 0.174 moles of carbon?
2. Atoms & Elements
Mole Concept
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How many formula units are in 8.38 g of LiOH?
A
1.26 x 10^23 formula units
B
2.50 x 10^22 formula units
C
6.02 x 10^23 formula units
D
3.02 x 10^24 formula units
Verified step by step guidance1
Determine the molar mass of LiOH by adding the atomic masses of lithium (Li), oxygen (O), and hydrogen (H). Use the periodic table to find these values: Li = 6.94 g/mol, O = 16.00 g/mol, H = 1.01 g/mol.
Calculate the molar mass of LiOH: Molar mass of LiOH = 6.94 g/mol (Li) + 16.00 g/mol (O) + 1.01 g/mol (H).
Convert the given mass of LiOH (8.38 g) to moles using the molar mass calculated in the previous step. Use the formula: \( \text{moles of LiOH} = \frac{\text{mass of LiOH}}{\text{molar mass of LiOH}} \).
Use Avogadro's number to convert moles of LiOH to formula units. Avogadro's number is \( 6.022 \times 10^{23} \) formula units/mol. Multiply the moles of LiOH by Avogadro's number to find the number of formula units.
Compare the calculated number of formula units to the given options to determine the correct answer.
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