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3 years ago

Use Scientific Notation

Chemistry

1 answer:

Ilia_Sergeevich [38]3 years ago

4 0

Answer:

5.0 x 10¹⁹ atoms

Explanation:

The positive exponent means that the decimal place was moved to the left and the exponent itself tells you how many places it moved.

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Which of the following molecules would you expect to have a dipole moment of zero?

Mashcka [7]

Answer:

CCl2=CCl2

Explanation:

Recall that the individual dipole moments in a symmetrical molecule cancel out each other thereby making the overall molecule to be non polar.

CCl2=CCl2 contain individual polar bonds but the molecule is highly symmetrical thus its dipole cancel out and the molecule has no overall dipole moment, hence CCl2=CCl2 has a dipole moment of zero .

6 0

3 years ago

Now that you have exercised, walked your

ASHA 777 [7]

Answer: The moles of melatonin are 0.000043

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}$

Given mass of melatonin = 0.01 g

Molar mass of melatonin $(C_{13}H_{16}N_2O_2)$ = 232.28 g/mol

$\text{Number of moles of melatonin}=\frac{0.01 g}{232.28g/mol}=0.000043mol$

Thus the moles of melatonin in 0.01 g are 0.000043

4 0

2 years ago

7.) A syringe initially holds a sample of gas with a volume of 285 mL at 355 K and 1.88 atm. To

marysya [2.9K]

Answer:

T₂ = 721 k

Explanation:

Given data:

Initial volume = 285 mL

Initial pressure = 1.88 atm

Initial temperature = 355 K

Final temperature = ?

Final volume = 435 mL

Final pressure = 2.50 atm

Formula:

P₁V₁/T₁ = P₂V₂/T₂

P₁ = Initial pressure

V₁ = Initial volume

T₁ = Initial temperature

P₂ = Final pressure

V₂ = Final volume

T₂ = Final temperature

Solution:

P₁V₁/T₁ = P₂V₂/T₂

T₂ = P₂V₂ T₁ / P₁V₁

T₂ = 2.50 atm × 435 mL × 355 K / 1.88 atm × 285 mL

T₂ = 386062.5 atm. mL. K /535.8 atm. mL

T₂ = 721 k

5 0

3 years ago

When given the following: density = 0.79 g/mL and mass =8g (answer can be found in your reading) What is the volume of the objec

tatyana61 [14]

Hey there!:

Density = 0.79 g/mL

mass = 8 g

Volume = ??

Therefore:

D = m / V

0.79 = 8 / V

Volume = 8 / 0.79

Volume = 10.126 mL

Hope this helps!

4 0

3 years ago

If a reaction has a very low activation energy, the products would be expected to form quickly at high temperatures. Select the

melamori03 [73]

Answer: Option (c) is the correct answer.

Explanation:

It is known that when Gibb's free energy, that is, $\Delta G$ has a negative value then the reaction will be spontaneous and the formation of products is favored more rapidly.

Activation energy is defined as the minimum amount of energy required to initiate a chemical reaction.

So, when reactants of a chemical reaction are unable to reach towards its activation energy then a catalyst is added to lower the activation energy barrier so the reaction can take place rapidly.

Since, the given reaction has low activation energy. Therefore, there is no need to add a catalyst.

And, when value of $\Delta G$ is positive then the reaction is spontaneous in nature and formation of products is less favored.

Thus, we can conclude that for the given situation positive delta G is the reason that a reaction might form products very slowly, or not at all.

8 0

3 years ago

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