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Tju [1.3M]
3 years ago
7

Match each phylum with the correct description

Chemistry
2 answers:
NNADVOKAT [17]3 years ago
7 0

Answer:

How do we answer it?

Explanation:

coldgirl [10]3 years ago
3 0
Is there a picture or something that can help me answer this?
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Two liters of oxygen (O2) is collected over water at 20oC. If the total pressure in the container is 95.00 kPa, what is the part
garri49 [273]

Answer:

THE PARTIAL PRESSURE OF OXYGEN GAS IN THE CONTAINER IS 92.67kPa WHICH IS OPTION B.

Explanation:

To calculate the partial pressure of oxygen gas collected over water, we use

Ptotal = Poxygen + P water

It is worthy to note that when oxygen is collected over water, it is mixed with water vapor and the total pressure in the container will be the sum of the pressure exerted by the oxygen gas and that of the water vapor at that given temperature.

At 20 C, the vapor pressure of water as given in the question is 2.33 kPa.

Using the above formula,

Ptotal = Poxygen + P water

Substituting for Poxygen, we have;

Poxygen = Ptotal - P water vapor

P oxygen = 95 .00 kPa - 2.33 kPa

P oxygen = 92.67 kPa.

The partial pressure of oxygen gas in the container is hence, 92.67kPa.

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3 years ago
2 of the important properties of gases. SaveStylesFormat Instructions
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4 years ago
To be able to see a measurable effect, your boiling point elevation must be at least 1.00°C. Knowing that the Kb­ of water is 0.
ale4655 [162]

Answer : The mass of calcium chloride (in g) needed is, 1.92 grams.

Explanation : Given,

Boiling point of elevation constant (K_b) for water = 0.512^oC/m

Mass of water (solvent) = Density\times Volume=1.00g/mL\times 26.63mL=26.63g=0.02663kg

Molar mass of CaCl_2 = 110.98 g/mole

Formula used :  

\Delta T_b=i\times K_b\times m\\\\\Delta T_b=i\times K_b\times\frac{\text{Mass of }CaCl_2}{\text{Molar mass of }CaCl_2\times \text{Mass of water in kg}}

where,

\Delta T_b = change in boiling point  = 1.00^oC

i = Van't Hoff factor = 3 (for electrolyte)

K_b = boiling point constant for water

m = molality

Now put all the given values in this formula, we get

1.00^oC=3\times (0.512^oC/m)\times \frac{\text{Mass of }CaCl_2}{110.98g/mol\times 0.02663kg}

\text{Mass of }CaCl_2=1.92g

Therefore, the mass of calcium chloride (in g) needed is, 1.92 grams.

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3 years ago
Which of the following statements is not true about the object moving with constant speed?
natali 33 [55]

Answer: B The speed of the object is equal to zero

Explanation:

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What impact did political parties in Africa have on the African desire for independence?
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They were important to help unify the Africans in their independence. How exactly were these political parties improved? Well, they were better organized, more unified in demands, had broad support, unwilling to compromise, willing to use any means necessary.
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