Multiple Choice
A silver necklace has a mass of 21.6 g. How many moles of silver atoms are present in the necklace? (Atomic mass of Ag = 107.87 g/mol)
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2. Atoms & Elements
Mole Concept
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How many moles are present in 2.5 g of N_2?
A
0.089 moles
B
0.18 moles
C
11 moles
D
1.3 moles
Verified step by step guidance1
Identify the given information: mass of nitrogen gas (N\_2) is 2.5 g.
Calculate the molar mass of N\_2. Since nitrogen (N) has an atomic mass of approximately 14.0 g/mol, the molar mass of N\_2 is calculated as \$14.0 \times 2 = 28.0$ g/mol.
Use the formula to find moles: \(\text{moles} = \frac{\text{mass}}{\text{molar mass}}\).
Substitute the known values into the formula: \(\text{moles} = \frac{2.5 \text{ g}}{28.0 \text{ g/mol}}\).
Perform the division to find the number of moles of N\_2 present in 2.5 g.
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