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Snezhnost [94]
3 years ago
14

Balance the equation. Mg3(PO4)2+? C → ? Mg3P2+? CO , using the smallest possible integers. What is the sum of the coefficients i

n the balanced equation?1. 14.
2. 16.
3. 12.
4. 18.
5. 22.
Chemistry
1 answer:
Nuetrik [128]3 years ago
8 0

Answer:

Sum of coefficients in balanced equation is 18

Explanation:

Unbalanced equation: Mg_{3}(PO_{4})_{2}+C\rightarrow Mg_{3}P_{2}+CO

Balance O: Mg_{3}(PO_{4})_{2}+C\rightarrow Mg_{3}P_{2}+8CO

Balance C: Mg_{3}(PO_{4})_{2}+8C\rightarrow Mg_{3}P_{2}+8CO

Balanced equation:Mg_{3}(PO_{4})_{2}+8C\rightarrow Mg_{3}P_{2}+8CO

Sum of coefficients in balanced equation = (1+8+1+8) = 18

So, option (4) is correct.

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Which of the following is the best hypothesis?
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Answer:

B.) If sodium carbonate is added to vinegar, the reaction will absorb heat.

Explanation:

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C.) is incorrect because this statement explains something that does not need to be tested. It is an example of a physical change when one tears a piece of paper.

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If the solubility of sodium chloride is 36 grams per 100 grams of water, which of the following solutions would be considered un
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Answer: If the solubility of sodium chloride is 36 grams per 100 grams of water then 5.8 moles of NaCl dissolved in 1 L of water solution would be considered unsaturated.

Explanation:

A solution which contains the maximum amount of solute is called a saturated solution. Whereas a solution in which more amount of solute is able to dissolve is called an unsaturated solution.

Now, the number of moles present in 36 g of NaCl (molar mass = 58.4 g/mol) is as follows.

No. of moles = \frac{mass}{molar mass}\\= \frac{36 g}{58.4 g/mol}\\= 0.616 mol

This shows that solubility of sodium chloride is 36 grams per 100 grams of water means a maximum of 0.616 mol of NaCl will dissolve in 100 mL of water.

So, a solution in which number of moles of NaCl are less than 0.616 mol per 100 mL then the solution formed will be an unsaturated solution.

  • As 5.8 moles of NaCl dissolved in 1 L (or 1000 mL) of water. So, moles present in 100 mL are calculated as follows.

Moles = \frac{5.8 mol}{1000 mL} \times 100 mL\\= 0.58 mol

  • Moles present in 100 mL of water for 3.25 moles of NaCl dissolved in 500 ml in water are as follows.

Moles = \frac{3.25 mol}{500 mL} \times 100 mL\\0.65 mol

  • Moles present in 100 mL of water for 1.85 moles of NaCl dissolved in 300 ml of water are as follows.

Moles = \frac{1.85 mol}{300 mL} \times 100 mL\\= 0.616 mol

Thus, we can conclude that if the solubility of sodium chloride is 36 grams per 100 grams of water then 5.8 moles of NaCl dissolved in 1 L of water solution would be considered unsaturated.

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