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3 years ago

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Chemistry

1 answer:

Evgen [1.6K]3 years ago

5 0

Answer:

Explanation:

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A solution contains 25 grams of KNO3 dissolved in 200. grams of H2O. What is the percent by mass of potassium nitrate in this so

Ierofanga [76]

Answer:

Percent mass of KNO3 in solution = 11% (Approx)

Explanation:

Given:

Mass of KNO3 = 25 grams

Mass of H2O = 200 grams

Find:

Percent mass of KNO3 in solution

Computation:

Mass of solution = 25 + 200 = 225 grams

Percent mass of KNO3 in solution = [25/225]100

Percent mass of KNO3 in solution = 11.111%

Percent mass of KNO3 in solution = 11% (Approx)

7 0

3 years ago

A volume of 125 mL of H2O is initially at room temperature (22.00 ∘C). A chilled steel rod at 2.00 ∘C is placed in the water. If

inn [45]

Answer:

$m_{steel}=54.47gSteel$

Explanation:

Hello,

In this case, one considers that the heat lost by the water is gained by the steel rod:

$\Delta H_{water}=-\Delta H_{steel}$

That in terms of masses, heat capacities and temperatures is:

$m_{water}Cp_{water}(T_F-T_{water})=-m_{steel}Cp_{steel}(T_F-T_{steel})$

Thus, solving for the mass of the steel rod, we obtain:

$m_{steel}=\frac{m_{water}Cp_{water}(T_F-T_{water})}{-Cp_{steel}(T_F-T_{steel})} \\\\m_{steel}=\frac{125mL*\frac{1g}{1mL}*4.18\frac{J}{g^oC} (22.00^oC-21.10^oC)}{-0.452\frac{J}{g^oC}*(2.00^oC-21.10^oC)} \\\\m_{steel}=54.47gSteel$

Best regards.

6 0

4 years ago

How is a gas affected when pressure temperature or volume change

Tanzania [10]

Answer:

The volume of a given gas sample is directly proportional to its absolute temperature at constant pressure (Charles's law). The volume of a given amount of gas is inversely proportional to its pressure when temperature is held constant (Boyle's law).

Explanation:

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3 years ago

4.2 grams of magnesium metal reacts with excess gold III chloride to form 5.9 grams of gold and also magnesium chloride. What is

Margaret [11]

Answer:

???

Explanation:

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3 years ago

The Tin Pan Alley era lasted from 1950 to 1967.<br> a. true<br> b. false

fenix001 [56]

I think false is the answer .if wrong correct meeee

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3 years ago