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4 years ago

Please help me. I'll give brainliest. I am stuck. True or false Q.

Chemistry

1 answer:

belka [17]4 years ago

5 0

I believe your answer is true! Hope this helps!

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What happens to the molecules within a gas when the gas condenses?

VashaNatasha [74]

I think it would lose energy

6 0

3 years ago

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Calculate the molality of a solution containing 15.01 g of glycerol (c 3h 8o 3) in 42.3 g of ethanol (c 2h 5oh).

kkurt [141]

The molality of the glycerol solution is 3.854mol/kg

The number of moles of solute present in a solution equal to 1 kg or 1000 g of solvent is referred to as its molality.

Given:

Mass, m1 of glycerol = 15.01g

Mass, m2 of ethanol = 42.3g

Molar mass, mm1 of glycerol = 92.095g/mol

Molar mass, mm2 of ethanol = 46.069g/mol

To find:

Molality, m = ?

Formula:

Molality, m = moles of solute / kg of solvent

Calculations:

No. of moles of glycerol = 15.01 x (1/92.095)

n = 0.163 mols

Molality, m = 0.163 / 0.0423g

Molality, m = 3.854mol/kg

Result:

3.854mol/kg is the molality of the glycerol solution.

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brainly.com/question/26921570

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7 0

1 year ago

What is the energy of a photon that emits a light of frequency 6.42 x 1014 Hz?

svetlana [45]

Answer:

Option B. 4.25×10¯¹⁹ J

Explanation:

From the question given above, the following data were obtained:

Frequency (f) = 6.42×10¹⁴ Hz

Energy (E) =?

Energy and frequency are related by the following equation:

Energy (E) = Planck's constant (h) × frequency (f)

E = hf

With the above formula, we can obtain the energy of the photon as follow:

Frequency (f) = 6.42×10¹⁴ Hz

Planck's constant (h) = 6.63×10¯³⁴ Js

Energy (E) =?

E = hf

E = 6.63×10¯³⁴ × 6.42×10¹⁴

E = 4.25×10¯¹⁹ J

Thus, the energy of the photon is 4.25×10¯¹⁹ J

3 0

4 years ago

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Temporary haircolor is attracted to hard keratin true false

Nady [450]

Answer:

Braniest please

Explanation:

I think true

7 0

3 years ago

How many molecules of sodium oxide will be created if 275 grams of sodium reacts with excess oxygen?

musickatia [10]

3.6 x 10²⁴molecules

Explanation:

Given parameters:

Mass of Na = 275g

Unknown:

Number of molecules of Na₂O =

Solution:

Since sodium is the limiting reactant, we first use it to find the number of mole of the Na₂O and transpose it into finding the number of molecules.

Given equation:

4Na + O₂ → 2Na₂O

Since the equation is balanced, let us find the number of moles of Na;

Number of moles = $\frac{mass}{molar mass}$ = $\frac{275}{23}$ = 11.96moles

From the equation of the reaction;

4 mole of Na produced 2 moles of Na₂O

11.96 moles of Na will produce $\frac{11.96 x 2}{4}$ = 6moles

1 mole of a substance = 6.02 x 10²³ molecules

6 moles of Na₂O = 6 x 6.02 x 10²³ molecules = 3.6 x 10²⁴molecules

learn more:

Number of moles brainly.com/question/1841136

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5 0

3 years ago