객관식
How many silver atoms are present in a 33.0 g bar of silver (Ag)? (Atomic mass of Ag = 107.9 g/mol)
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- 1. Intro to General Chemistry3h 46m
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2. Atoms & Elements
Mole Concept
객관식
How many moles are present in 35 g of H_2O?
A
0.35 moles
B
1.94 moles
C
0.65 moles
D
3.5 moles
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검증된 단계별 안내1
Identify the given information: the mass of water (H_2O) is 35 grams.
Determine the molar mass of water by adding the atomic masses of its elements: hydrogen (H) has an atomic mass of approximately 1 g/mol, and oxygen (O) has an atomic mass of approximately 16 g/mol. Since water has 2 hydrogens and 1 oxygen, calculate the molar mass as \(2 \times 1 + 16\) g/mol.
Use the formula to find moles: \(\text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}}\).
Substitute the known values into the formula: \(\text{moles} = \frac{35}{\text{molar mass of H_2O}}\).
Perform the division to find the number of moles present in 35 g of water.
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