Multiple Choice
How many atoms of carbon are present in 0.68 moles of carbon?
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2. Atoms & Elements
Mole Concept
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In one mole of Sr(HCO3)2, how many moles of each element are present?
A
1 mole Sr, 1 mole H, 2 moles C, 6 moles O
B
2 moles Sr, 2 moles H, 2 moles C, 6 moles O
C
1 mole Sr, 2 moles H, 1 mole C, 6 moles O
D
1 mole Sr, 2 moles H, 2 moles C, 6 moles O
Verified step by step guidance1
Identify the chemical formula given: Sr(HCO3)2. This means one formula unit contains 1 Sr atom and 2 HCO3 groups.
Determine the number of atoms of each element in one HCO3 group: H = 1, C = 1, O = 3.
Multiply the number of atoms in one HCO3 group by 2 (since there are 2 HCO3 groups): H = 2, C = 2, O = 6.
Count the Sr atoms, which is 1 per formula unit.
Summarize the total moles of each element in 1 mole of Sr(HCO3)2: Sr = 1 mole, H = 2 moles, C = 2 moles, O = 6 moles.
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