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3 years ago

Balance of Atoms Quick Check

Chemistry

2 answers:

castortr0y [4]3 years ago

7 0

Answer:

Explanation:

I took the test

san4es73 [151]3 years ago

3 0

When iron rusts and forms iron oxide, the iron oxide has more mass than the iron because there are more iron atoms in iron oxide than in pure iron.

The process of rust occurs when pure iron is exposed to air and moisture. Rust is the oxidation of pure iron to iron II oxide (Fe2O3).

We can see that there are two iron atoms per mole of Fe2O3 whereas there is only one iron atom in each mole of pure iron.

Therefore, iron oxide has more mass than the iron because there are more iron atoms in iron oxide than in pure iron.

Learn more; brainly.com/question/18376414

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Benzene is 92.3% carbon and 7.7% hydrogen. In anexperiment,

Marysya12 [62]

Answer:

The molecular formula of benzene = $C_{6}H_{6}$

Explanation:

$Moles =\frac {Given\ mass}{Molar\ mass}$

% of C = 92.3

Molar mass of C = 12.0107 g/mol

% moles of C = $\frac{92.3}{12.0107}$ = 7.6848

% of H = 7.7

Molar mass of H = 1.00784 g/mol

% moles of H = $\frac{7.7}{1.00784}$ = 7.6401

Taking the simplest ratio for C and H as:

7.6848 : 7.6401

= 1 : 1

The empirical formula is = $CH$

Molecular formulas is the actual number of atoms of each element in the compound while empirical formulas is the simplest or reduced ratio of the elements in the compound.

Thus,

Molecular mass = n × Empirical mass

Where, n is any positive number from 1, 2, 3...

Mass from the Empirical formula = 12+ 1 = 13 g/mol

Molar mass = 78.0 g/mol

So,

Molecular mass = n × Empirical mass

78.0 = n × 13

⇒ n ≅ 6

<u>The molecular formula of benzene = $C_{6}H_{6}$ </u>

7 0

4 years ago

What is meant by saying that the latent heat of vaporization of water is 22. 5Ã—10^5 j/kg.

andrey2020 [161]

It means that 22.5×10^5 J of heat is required to change 1 kg of water into steam.

Latent heat of vaporization is amount of energy required to change 1 gram (in this example 1 kilogram) of material from the liquid to the gaseous state at its boiling point.

Boiling point of the water is 100°C.

Joule (J) is the standard unit for energy (in this example heat).

Evaporization is phase change process in which the water changes from a liquid to a gas (water vapor). Fore example, solar radiation can be the source of energy for evaporation.

More about heat of vaporization: brainly.com/question/14679329

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5 0

2 years ago

1. When 50.0 mL of water at 80.0°C was mixed with 50.0 mL of water in a calorimeter at

ddd [48]

Answer:

The heat capacity of the calorimeter is 5.11 J/g°C

Explanation:

Step 1: Given data

50.0 mL of water with temperature of 80.0 °C

Specific heat capacity of water = 4.184 J/g°C

Consider the density of water = 1g/mL

50.0 mL of water in a calorimeter at 20.0 °C

Final temperature = 47.0 °C

Step 2: Calculate specific heat capacity of the water in calorimeter

Q = Q(cal) + Q(water)

Q(cal) = mass * C(cal) * ΔT

Qwater = mass * Cwater * ΔT

Qcal = -Qwater

mass(cal) * C(cal) * ΔT(cal) = mass(water) * C(water) * ΔT(water)

50 grams * C(cal) * (47.0 - 20.0) =- 50grams * 4.184 J/g°C * (47-80)

1350 * C(cal) = 6903.6

C(cal) = 5.11 J/g°C

The heat capacity of the calorimeter is 5.11 J/g°C

8 0

3 years ago

QUESTION 7 Can you use alligation for any type of liquid?

NeTakaya

Answer:

Yes you can use alligation for a type of liquid. Explanation: Alligation is an old and practical method of solving arithmetic problems related to mixtures of ingredients.

5 0

3 years ago

Homeostasis is the balance between your internal and external environments. We

topjm [15]

Answer:

They are already matched for you. It goes

in the order of the questions.

8 0

3 years ago