Multiple Choice
How many oxygen atoms are present in one molecule of H_2O?
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3. Chemical Reactions
Molecular Formula
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Which of the following is the correct molecular formula for calcium carbonate?
A
CaCO_2
B
Ca_2CO_3
C
CaCO_3
D
Ca_2(CO_3)_2
Verified step by step guidance1
Identify the ions involved in calcium carbonate: calcium ion (Ca^{2+}) and carbonate ion (CO_3^{2-}).
Recall that calcium has a charge of +2 and carbonate has a charge of -2, so they combine in a 1:1 ratio to balance the charges.
Write the formula by combining one calcium ion with one carbonate ion, resulting in CaCO_3.
Check the options given and compare them to the correct formula CaCO_3 to see which matches the correct ratio and composition.
Confirm that CaCO_3 is the correct molecular formula because it reflects the proper stoichiometric balance of calcium and carbonate ions.
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