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prisoha [69]
3 years ago
5

A different consideration of hardness is an issue that applies to the chemistry of swimming pool water. In this case, appreciabl

e hardness is desired because it deters the pool water from leaching minerals, for example, from tile grout. You analyze the pool water for a friend and determine it has calcium hardness of 175 mg/L as CaCO3. The professional pool maintenance guideline is that calcium hardness should be between 5 and 10 millimoles Ca2 per liter. You convert the concentration expressed as 175 mg/L CaCO3 to compare it to the Ca2 guideline. What is the concentration of Ca2 in mM
Business
1 answer:
kenny6666 [7]3 years ago
3 0

Answer:

1.748 mM

Explanation:

Concentration in g / L = Molarity × molar mass

molar mass of calcium carbonate = 100.0869 g/mol

175 mg/L =    175 ÷ 1000 = 0.175 g/L

0.175 g/L = Molarity × 100.0869 g/mol

(0.175 g/L) / 100.0869 = Molarity

Molarity = 0.001748 M

CaCO₃ → Ca²⁺ + CO₃²⁻ when it dissociate in water.

1 M of  CaCO₃ yielded 1 M of Ca²⁺

0.001748 M of  CaCO₃ will also yield 0.001748 M of  Ca²⁺

then 0.001748 × 1000 = 1.748 mM concentration of Ca²⁺

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Answer:

a) Firm’s return on assets = 11.46 %

b) Return on stockholders’ equity = 19.37%

c) Profit margin = 3.27%

Explanation:

a) Return on assets = \frac{Net Income}{Total Assets} X 100

= \frac{196,000}{1,710,000} X 100 = 11.46 percent

b) Return on stockholder's equity = \frac{Net income}{Equity} X 100

Equity =Total assets - Debt = $1,710,000 - $698,000 = $1,012,000

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b) Return on stockholders’ equity = 19.37%

c) Profit margin = 3.27%

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4 years ago
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Answer: False

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Bonds are calculated by discounting cashflows over the life of the bond. For a longer term bond therefore, there will be more cashflows over longer periods that need discounting. If rates were to change therefore, the present value of the cashflows especially for the ones further away, will be affected more therefore the long term bond price will be affected more as well.

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