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tino4ka555 [31]
3 years ago
10

1.the water on the surface of the earth

Chemistry
1 answer:
allsm [11]3 years ago
4 0
1:hydropsphere                                                                                                 2:electrolyte                                                                                                          3:photosynthesis                                                                                                    4:desalination
hope this helped!
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How many molecules are in 1 mole of H2O
Olegator [25]

Answer:

A mole (mol) is the amount of a substance that contains 6.02 × 10 23 representative particles of that substance. The mole is the SI unit for the amount of a substance. There are, therefore, 6.02 × 10 23 water molecules in a mole of water molecules. Water (H2O) is made from 2 atoms of hydrogen and 1 atom of oxygen.

8 0
2 years ago
Calculate the molecular weight when a gas at 25.0 ∘C and 752 mmHg has a density of 1.053 g/L . Express your answer using three s
stiks02 [169]

Answer:

26.0 g/mol is the molar mass of the gas

Explanation:

We have to combine density data with the Ideal Gases Law equation to solve this:

P . V = n . R .T

Let's convert the pressure mmHg to atm by a rule of three:

760 mmHg ____ 1 atm

752 mmHg ____ (752 . 1)/760 =  0.989 atm

In density we know that 1 L, occupies 1.053 grams of gas, but we don't know the moles.

Moles = Mass / molar mass.

We can replace density data as this in the equation:

0.989 atm . 1L = (1.053 g / x ) . 0.082 L.atm/mol.K . 298K

(0.989 atm . 1L) / (0.082 L.atm/mol.K . 298K) = 1.053 g / x

0.0405 mol = 1.053 g / x

x =  1.053 g / 0.0405  mol = 26 g/mol

7 0
3 years ago
PLEASE HELP ASAP!!!
kogti [31]
1 CH4 (g) + 2 O2 (g) -----> CO2 (g) + 2H2O(l) ΔH= - 890 kJ
1 mol           2 mol
1)  If ΔH has minus, it means "release". We need only "release" choices.<span>
2) From reaction
1 mol </span>CH4 (g)  "releases"  ΔH= - 890 kJ  - We do not have this choice.

2 mol  O2 (g)   "release" ΔH= - 890 kJ, so
1 mol  O2 (g)   "release" ΔH= - 445 kJ
Correct answer is B.
3 0
3 years ago
Read 2 more answers
PCl5(g) ⇋ PCl3(g) + Cl2(g)
dmitriy555 [2]

Answer:

The total pressure in the container is 2 atm (Option B)

Explanation:

Step 1: Data given

The initial pressure of the PCl5(g) is 1.00 atm

Volume of the container = 1.00 L

Step 2: The balanced equation

PCl5(g) ⇋ PCl3(g) + Cl2(g)

Step 3: Calculate the total pressure in the container

1mol of ideal gas has a pressure of 1 atm

If 1 mol of PCl5 completely decomposes into 1 mol PCl3 and 1 mol Cl2

Then the pressure for 1 mol PCl3 and 1 mol Cl2 is for both  1 atm

The total pressure would be 2*1 atm = 2 atm

The total pressure in the container is 2 atm

7 0
3 years ago
Read 2 more answers
If a plant cell is placed in a solution and the cell shrivels up, what type of solution was it placed in? How do you know?
PolarNik [594]

Answer:

The cell is in a Hypotonic solution. When a cell is in a Hypotonic solution the lower osmotic pressure causing water to move across the pressure gradient into the solution causing the cell to shrivel.

5 0
2 years ago
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