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kipiarov [429]
3 years ago
11

Which is a freshwater region characterized as a large standing body of water? A. lake B. river C. ocean D. stream

Physics
2 answers:
prisoha [69]3 years ago
5 0

Answer:

A. Lake

Explanation:

We need to recall that the water which contains less than 1% salts is called as freshwater.

In lakes water comes from rain, melting of ice from mountains, seepage of ground water, and water streams. These all are fresh sources of water. Therefore, A is the right answer.  

B is not the right answer because river water dissolves salts while passing through the stones and riverbeds. So, water is not always fresh in rivers.  

C is not correct, because ocean water contains a huge amount of salts.

Although streams have fresh water but they also have small size. Therefor, D is also not right answer.

Alexus [3.1K]3 years ago
4 0
This is A.) lake. A river is a small amount of water that isn't always fresh water. A stream is too small. And an ocean is made of salt water.
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8 0
2 years ago
A mixture of helium and oxygen is used in scuba diving tanks to help prevent ""the bends"". 46 L helium and 12 L oxygen are comb
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Answer

given,

For helium

Volume,V = 46 L

Pressure,P = 1 atm

Temperature,T = 25°C  =  273 +25 = 298 K

R=0.0821 L . atm /mole.K

n₁ = ?

number of moles

we know

P V = n R T

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For oxygen

Volume,V = 12 L

Pressure,P = 1 atm

Temperature,T = 25°C  =  273 +25 = 298 K

R=0.0821 L . atm /mole.K

n₂ = ?

number of moles

we know

P V = n R T

n_2 =\dfrac{12 \times 1}{0.0821\times 298}

  n₂ = 0.49 moles

Total volume of tank = 5 L

temperature of tank = 298 K

Partial pressure of helium

P_1=\dfrac{n_1 R T}{V}

P_1=\dfrac{1.89\times 0.0821\times 298}{5}

     P₁ = 9.25 atm

Partial pressure of oxygen

P_2=\dfrac{n_2 R T}{V}

P_2=\dfrac{0.49\times 0.0821\times 298}{5}

    P₂ = 2.39 atm

total pressure

    P = P₁ + P₂

    P = 9.25 + 2.39

    P = 11.64 atm

8 0
3 years ago
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