I believe the answer would be b
From the periodic table:
mass of oxygen = 16 grams
mass of calcium = 40 grams
mass of carbon = 12 grams
mass of CaCO3 = 40 + 12 + 3(16) = 100 grams
Therefore, each 100 grams of CaCO3 contains 3 moles of oxygen
To know the number of oxygen moles in 25.45 grams, we will simply do cross multiplication as follows:
number of oxygen moles = (25.45 x 3) / 100 = 0.7636
The answer is: [D]: " AgCl " .
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Explanation:
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Given the chemical reaction:
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NaCl (aq) + AgNO₃ (aq) <span>→ </span> NaNO₃ (aq) + AgCl (s) ;
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The "reactants" , which are on the "left-hand side" of the chemical equation, are:
"NaCl" (in aqueous solution); and "AgNO₃" (in aqueous solution).
The "products", which are on the "right-hand side" of the chemical equation, are:
"NaNO₃" (in aqueous solution); and: "AgCl" (as a "solid").
The "AgCl" (as a "product"—which is a "solid"—would be the "precipitate" ;
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→ which is: Answer choice: [D]: " AgCl " .
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