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How many moles of each element are in one mole of [tex]$Sr \left( HCO_3 \right)_2$[/tex]?

A. 1 mole of strontium, 1 mole of hydrogen, 1 mole of carbon, 5 moles of [tex]O[/tex]
B. 1 mole of strontium, 2 moles of hydrogen, 2 moles of carbon, 6 moles of [tex]O[/tex]
C. 2 moles of strontium, 2 moles of hydrogen, 2 moles of carbon, 5 moles of [tex]O[/tex]
D. 2 moles of strontium, 2 moles of hydrogen, 2 moles of carbon, 6 moles of [tex]O[/tex]



Answer :

GinnyAnswer
To determine the number of moles of each element in one mole of [tex]\( \text{Sr} \left( \text{HCO}_3 \right)_2 \)[/tex], let's break down the compound step-by-step.

1. Strontium (Sr):
The chemical formula [tex]\( \text{Sr} \left( \text{HCO}_3 \right)_2 \)[/tex] indicates that there is exactly one atom of Strontium (Sr) in each molecule. Thus, one mole of [tex]\( \text{Sr} \left( \text{HCO}_3 \right)_2 \)[/tex] contains:
- 1 mole of Strontium (Sr)

2. Hydrogen (H):
Inside the parentheses, the compound has [tex]\( \text{HCO}_3 \)[/tex]. There are 2 of these groups in [tex]\( \text{Sr} \left( \text{HCO}_3 \right)_2 \)[/tex], and each [tex]\( \text{HCO}_3 \)[/tex] group contains 1 hydrogen atom. Therefore:
- 2 moles of Hydrogen (H)

3. Carbon (C):
Each [tex]\( \text{HCO}_3 \)[/tex] group also contains one carbon atom. Since there are 2 [tex]\( \text{HCO}_3 \)[/tex] groups in [tex]\( \text{Sr} \left( \text{HCO}_3 \right)_2 \)[/tex]:
- 2 moles of Carbon (C)

4. Oxygen (O):
Each [tex]\( \text{HCO}_3 \)[/tex] group contains 3 oxygen atoms. With 2 [tex]\( \text{HCO}_3 \)[/tex] groups, we have:
- 6 moles of Oxygen (O)

So, in summary, one mole of [tex]\( \text{Sr} \left( \text{HCO}_3 \right)_2 \)[/tex] contains:
- 1 mole of Strontium (Sr)
- 2 moles of Hydrogen (H)
- 2 moles of Carbon (C)
- 6 moles of Oxygen (O)

Thus, the correct answer is:

1 mole of strontium, 2 moles of hydrogen, 2 moles of carbon, and 6 moles of oxygen.

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