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3 years ago

By what process does water vapor become a cloud?

Chemistry

2 answers:

lions [1.4K]3 years ago

8 0

The answer is evaporation

Ivanshal [37]3 years ago

6 0

The answer is c. condensation

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What is the molecular weight, density, and how many moles in

OverLord2011 [107]

Answer:

1) Molecular weight: 18g/mol

Density: at room temperature (25ºC) is 0.997g/mL

Moles: 0.55moles

2) Molecular weight: 182g/mol

Density: at room temperature (25ºC) is 1.11g/mL

Moles: $2.2x10^{-4}moles$

Explanation:

1) The molecular formula of water is $H_{2}O$ thus, the molecular weight is the sum of the weights of its atoms.

H: 1g/mol x 2 = 2g/mol

O: 16g/mol x 1 = 16g/mol

$H_{2}O$ : 2g/mol + 16g/mol = 18g/mol

The density (δ) of water at room temperature (25ºC) is 0.997g/mL

Therefore, the weight (m) of 1mL of water is:

m = δ.V = $0.997\frac{g}{mL}. 1mL = 0.997g$

Multiplying the mass by its molecular weight gives the number of moles:

$\frac{0.997g }{18g/mol} = 0.55 moles$

2) The molecular formula of benzophenone is $C_{13}H_{10}O$ thus, the molecular weight is the sum of the weights of its atoms.

C: 12g/mol x 13 = 156g/mol

H: 1g/mol x 10 = 10g/mol

O: 16g/mol x 1 = 16g/mol

$C_{13}H_{10}O$ : 156g/mol + 10g/mol + 16g/mol = 182g/mol

The density (δ) of water at room temperature (25ºC) is 1.11g/mL

Multiplying the mass by its molecular weight gives the number of moles:

$\frac{0.04g }{182g/mol} = 2.2x10^{-4}moles$

3 0

4 years ago

Read 2 more answers

What has to be true in order for a single replacement reaction to happen?

ella [17]

Answer: A

Explanation:

One element replaces another in a compound.

4 0

2 years ago

A jeweler guarantees that a piece of jewelry is at least 95% gold, by mass. You consider buying a piece of gold jewelry that wei

ELEN [110]

The density of the sample is:
Density = mass / volume
Density = 9.85 / 0.675
Density = 14.6 g/cm³

If the sample has 95% gold, and 5% silver, its density should be:
0.95 x 19.3 + 0.05 x 10.5
Theoretical density = 18.9 g/cm³

The difference in theoretical and actual densities is very large, making it likely that the jeweler was not telling the truth.

8 0

4 years ago

Consider four small molecules, A–D, which have the following binding affinities for a specific enzyme (these numbers are the equ

ehidna [41]

Answer:

Binding affinity measures the strength of the interaction between a molecule to its ligand; it is expressed in terms of the equilibrium dissociation constant; and the higher value of this constant, the more weaker the binding between the molecule and the ligand is. On the other hand, small constans means that the interaction is tight. So "C" binds most tightly to the enzyme and "D" binds least tightly.

8 0

4 years ago

What two pieces of evidence did van Helmont use to reach his conclusion

Sav [38]

Explanation:

He weighed silver, dissolved it in acid, and then recovered all the original silver by reacting the solution with copper. He also showed, by using iron to recover the copper, that this displacement of one metal from its salt by using a second metal was not because of transmutation, as many had held.

6 0

2 years ago