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3 years ago

Water is a substance made up of the elements hydrogen

Chemistry

2 answers:

hichkok12 [17]3 years ago

6 0

I think it might be 3

xeze [42]3 years ago

3 0

Answer:

A. 2

Explanation:

A particle of water is made up of two hydrogen atoms and one oxygen atom. However, the question asked for how many types of atoms there are, so the answer is 2.

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Assuming that sea water is a 3.5 wt % solution of NaCl in water, calculate its osmotic pressure at 20°C. The density of a 3.5% N

olga nikolaevna [1]

Answer:

π = 14.824 atm

Explanation:

wt % = ( w NaCL / w sea water ) * 100 = 3.5 %

assuming w sea water = 100 g = 0.1 Kg

⇒ w NaCl = 3.5 g

osmotic pressure ( π ):

π = C NaCl * R * T

∴ T = 20 °C + 273 = 293 K

∴ C ≡ mol/L

∴ density sea water = 1.03 Kg/L....from literature

⇒ volume sea water = 0.1 Kg * ( L / 1.03 Kg ) = 0.097 L sln

⇒ mol NaCl = 3.5 g NaCL * ( mol NaCL / 58.44 g ) = 0.06 mol

⇒ C NaCl = 0.06 mol / 0.097 L = 0.617 M

⇒ π = 0.617 mol/L * 0.082 atm L / K mol * 293 K

⇒ π = 14.824 atm

7 0

3 years ago

What is a trial? please

lesya692 [45]

Examination by a test; experiment, as in chemistry, metallurgy, etc.

7 0

3 years ago

Cane sugar is being manufactured at the rate of 500 kg/hr from sugar canes that have the following composition (% by weight):

My name is Ann [436]

Answer:

a. 4166,67 b. 74553.0

Explanation:

6 0

2 years ago

I WILL MARK BRAINLIEST!!!!! !! (picture included with one question ^^^^^^^)

o-na [289]

Answer:

type D

balance form .b

Explanation:

5 0

2 years ago

6.) Choose all of the following that are TRUE regarding the Ideal Gas Law.

Cerrena [4.2K]

Answer:

All temperatures must be in Kelvins.

Explanation:

What you have to know;

When Pressure is in atm units

Temperature must be in Kelvins.
Volume must be in cubic centimetres.
R = 0.0813

When Pressure is in Pascals or N/m^2

Temperature must be in Kelvins.
Volume must be in cubic metres.
R = 8.314

4 0

3 years ago