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3 years ago

1 What direction do molecules move in?

Chemistry

1 answer:

notsponge [240]3 years ago

3 0

Answer:

The majority of the molecules move from higher to lower concentration, although there will be some that move from low to high. The overall (or net) movement is thus from high to low concentration.

hope this helps!<3

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You have 16.0 g of some compound and you perform an experiment to remove all of the oxygen, 11.2 g of iron is left. What is the

oksian1 [2.3K]

The empirical formula of this compound is equal to $Fe_{2}O_3$ .

<h3>Empirical formula</h3>

To calculate the empirical formula of a compound, it is necessary to know the number of moles present.

Therefore, we will use the molar mass of iron and oxygen to find the amount of moles, so that:

$MM_O = 16g/mol\\MM_Fe = 55.8g/mol$

$MM = \frac{m}{mol}$

Oxygen

$16 = \frac{4.8}{mol}$

$mol = 0.3$

Iron

$55.8 = \frac{11.2}{mol}$

$mol = 0.2$

Finally, as the empirical formula is composed of integers numbers of moles, just multiply the values by the smallest common factor to transform into an integer, so that:

O => $0.3 \times 10 = 3moles$

Fe => $0.2 \times 10 = 2moles$

So, the empirical formula of this compound is equal to $Fe_{2}O_3$

Learn more about empirical formula in: brainly.com/question/1363167

6 0

3 years ago

How much energy is required when a 142.1 gram sample of aluminum goes from 25.5°C to 46°C? (the specific heat of aluminum is 0.9

vfiekz [6]

Answer:

2621.75 j heat is required to increase the temperature 25.5°C to 46°C.

Explanation:

Given data:

Mass of sample = 142.1 g

Initial temperature = 25.5°C

Final temperature = 46°C

Specific heat capacity of Al = 0.90 J/g.°C

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 46°C - 25.5°C

ΔT = 20.5°C

Q = 142.1 × 0.90 J/g.°C × 20.5°C

Q = 2621.75 j

Thus, 2621.75 j heat is required to increase the temperature 25.5°C to 46°C.

4 0

3 years ago

A certain reaction has an activation energy of 67.0 kJ/mol and a frequency factor of A1 = 4.20×1012. What is the rate constant,

MrRa [10]

Answer:

K = 7.00

Explanation:

<u>1) Arrhenius equation</u>

Arrhenius equation shows the relation between activation energy, temperature, and the equilibrium constant.

This is the equation:

$K=Ae^{-Ea/RT}$

Where:

K is the equilibrium constant,
A is the frequency factor,
Ea is the activation energy (in J/mol),
T is the temperature in kelvins (K), and
R is the universal constant.

<u></u>

<u>2) Substitute, using the right units, and compute:</u>

A = 4.20 × 10¹² (dimensionless)
Ea = 67.0 kJ/mol = 67,000 J/mol
T = 24.0°C = 24.0 + 273.15 K = 297.15 K
R = 8.314 J/K mol

$K=Ae^{-Ea/RT}=(4.20)(10)^{12}e^{-67,000J/mol/(8.314J/molK.297.15K)}$

K = 7.00

5 0

3 years ago

What is the correct name of the compound Pb(NO3)2?

Margaret [11]

Answer:

it's lead (ii) nitrate the name

4 0

2 years ago

What % is 16 out of 20?<br> Is it REALLY 80%???

marshall27 [118]

Yes, it is 80%. Hope this helps!

7 0

3 years ago

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