which of the following is a compound?

Answer:

Empirical formula: Na3S4O9

Molecular formula: Na6S8O18

Explanation:

1) To find the empirical formula, which is the simplest whole number ratio of each element that makes up this unknown compound, we first divide the portion of each element by it's respective atomic mass.

Na= 23g/mol, S= 32g/mol, O=16g/mol

Na = 20.2/23 = 0.878mol

S = 37.6/32 = 1.175mol

O = 42.2/16 = 2.638mol

Next, we divide each number of moles by the smallest value (0.878mol)

Na = 0.878/0.878 = 1

S = 1.175/0.878 = 1.34

O = 2.638/0.878 = 3.004

Next, we multiply each decimal fraction by 3 to make it whole no:

Na = 3

S= 4.02 ~ 4

O= 9.012 ~ 9

The simplest ratio between Na, S and O is 3:4:9 hence, the empirical formula is Na3S4O9

2) To get the molecular formula, we use the molecular weight of each element in the empirical ratio, and the overall molar mass of the compound i.e.

Molar mass of compound= 682.8g/mol

molecular weight of Na3S9O4 = (3 x 23g/mol) + (4 x 32 g/mol) + (9 x 16 g/mol)

= 69 + 128 + 144

= 341 g/mol

Hence, (Na3S4O9)n = 682.8g/mol

= (341)n = 682.8

n = 682.8/341

n = 2.002

n~ 2

Hence, molecular formula = (Na3S4O9)2

= Na6S8O18

The empirical and molecular formula are Na₃S₄O₉ and Na₆S₈O₁₈

respectively.

The empirical formula can be gotten by dividing each element by it's

respective atomic mass.

Na= 23g/mol, S= 32g/mol, O=16g/mol

Na = 20.2/23 = 0.878mol

S = 37.6/32 = 1.175mol

O = 42.2/16 = 2.638mol

Then divide each number of moles by the smallest value  which in this case is 0.878mol.

Na = 0.878/0.878 = 1

S = 1.175/0.878 = 1.34

O = 2.638/0.878 = 3.004

Next, we multiply each decimal fraction by 3 to make it whole no:

Na = 3

S= 4.02 ~ 4

O= 9.012 ~ 9

The simplest ratio between Na, S and O is 3:4:9 hence, the empirical formula is Na₃S₄O₉

The molecular formula is calculated by multiplying the molecular weight of each element with empirical ratio to get overall molar mass of the compound

Molar mass of compound is given as 682.8g/mol

Molecular weight of Na₃S₉O₄ = (3 x 23g/mol) + (4 x 32 g/mol) + (9 x 16 g/mol)

= 69 + 128 + 144

= 341 g/mol

Hence, (Na3S4O9)n = 682.8g/mol

= (341)n = 682.8

n = 682.8/341

n = 2.002

n~ 2

Hence, molecular formula = (Na₃S₄O₉)²

= Na₆S₈O₁₈

Answer:

c

Explanation:

Answer:

C

Explanation:

The respiratory is breathing

The muscular system is the movement

Answer:

A

Explanation:

because its weathering them down.

120V is the AC voltage on a single hot wire in your home with respect to neutral (or ground). ... The 0V line in the middle is the voltage of your neutral line. AC power oscillates at 60 cycles per second (60 Hz) in the U.S. Other parts of the world use a 50Hz standard. The AC voltage oscillates from +120V to -120V

Answer: 6y-2

Explanation: If it is not equal to something, then it will just be plain old

6y-2. Unless you have to graph it...

Answer:

48 g S

Explanation:

Step 1: Define

Molar Mass of Sulfur (S) - 32.07 g/mol

Step 2: Use Dimensional Analysis

[tex]1.5 \hspace{3} mol \hspace{3} S(\frac{32.07 \hspace{3} g \hspace{3} S}{1 \hspace{3} mol \hspace{3} S} )[/tex] = 48.105 g S

Step 3: Simplify

We have 2 sig figs.

48.105 g S ≈ 48 g S

Answer: The answer is D - radioactive decay

Explanation:  I took the test and got this question correct.

A source of energy that is internal to the Earth's systems is radioactive decay which is option D.

The source of energy that is internal to the earth's systems is radioactive decay.
Radioactive decay is a natural process in which unstable atomic nuclei release energy in the form of radiation. The decay of radioactive isotopes found in the Earth's crust and mantle produces this energy. It contributes to the Earth's internal heat and is important in many geological processes, including plate tectonics and volcanic activity. Radioactive decay, unlike external sources such as the Sun, Moon, and tides, is a source of energy that begins within the Earth itself.

Therefore, the correct option is option d

Learn more about Earth's internal energy here:

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Answer:

If it loses an electron it becomes a positive ion. Picture 1.8 Some atoms lose electrons and become positive ions. A lithium atom has 3 protons and 3 electrons. It can lose one of its electrons, making it an ion

Explanation:

Answer:

1. B- weight

2. B- 2.0g/cm3

3. C- 22.8g/cm3

Explanation:

Answer:

A.Hypothesis

Explanation:

Answer:

Yes

Explanation:

Hypothesis: If i increase the number of hours i practice, then i will score more goals in soccer.

Set up. I would have two people who don't play soccer. One will be practicing for one hours every day, and the other will be practicing three hours every day. Based on my hypothesis, the person that is training three hours every day will score more goals than the person training one hour a day.

Answer:

3) it is a good conductor heat.

Explanation:

An object is made from a material that is hard, shiny, and can be hammered into thin sheets. The aforementioned properties are those of a metal. Therefore, the other property of a metal is that, it is a good conductor of heat and even electricity because there valence (outer) electrons are delocalized. Some examples of chemical elements that are metals are iron, gold, sodium, silver, copper etc.

Answer: Most food dyes are acid dyes, so called because they only work in acidic conditions. The vinegar—a solution of 5 percent acetic acid in water—is there to bring the pH low enough that the dye will actually bind.

Explanation: Brainlest please

Answer:

0.228 J/g°C

Explanation:

The specific heat capacity, denoted by c, can be calculated using the formula:

Q = m × c × ∆T

Where; Q = amount of heat

m = mass

c = specific heat capacity

∆T = change in temperature

In this question, m = 9.0g, Q = 127J, T1 = 23°C, T2 = 85°C

Using, Q = m × c × ∆T

127 = 9 × c × (85-23)

127 = 9 × c × 62

127 = 558c

c = 127/558

c = 0.2275

c = 0.228 J/g°C

Answer: 27

Explanation:

3*3*3

you take l*w*h (3*3*3)

Answer:

After 6sec 5 atoms will be left.

Explanation:

Given data:

Total atoms of Highlinium = 40

Half life = 2 sec

Atoms left after 6sec = ?

Solution:

First of all we will calculate the number of half lives passes during 6sec.

Number of half lives = Time elapsed/ half life

Number of half lives = 6 sec / 2sec

Number of half lives = 3

Now we will calculate the number of atoms left

At time zero = 40 atoms

At 1st half life = 40 atoms/2 = 20 atoms

At 2nd half life = 20 atoms/2 = 10 atoms

At 3rd half life = 10 atoms / 2 = 5 atoms

Thus, after 6sec 5 atoms will be left.

Answer:

Chemical Energy

Explanation:

Answer:

yes

Explanation:

Answer:

Explained below

Explanation:

Newton's law of inertia states that An object at rest will remain continue at rest or if in motion, will continue in motion unless in both cases it is acted upon by a net external force.

Now, If two forces on the rope are equal and opposite forces, then the net force on the rope will be zero and it will not move. Thus,balance force is present in the rope and the rope will remain at rest since the net force is zero or it will continue in motion if already in motion without stopping since net force is zero

However, if the forces are acting in the same direction, it will result in an unbalanced force which means that the net force will be equal to the sum of the two forces and this will result in a stronger force than even the 2 individual forces and consequently it will cause the rope at rest to move, or if the rope is in motion, it will cause it to stop.

There are six liquids found on the periodic table.

1. Bromine

2. Mercury

3. Caesium

4. Gallium

5. Rubidium

6. Francium

Answer:

it's D my guy

Explanation:

Answer:

I took a usatestprep with this same question so i know the answer is D

Hopefully you find this helpful. :)

The measurement 45 N represent the magnitude (size) of a force in photograph. Therefore, option C is correct.

The magnitude of the force is the number that represents the force's strength. Assume the force is 10 N in the direction of the east. The direction is indicated by 'towards east,' and the magnitude is indicated by '10'. Magnitude is thus the 'value' or 'amount' of any physical quantity.

The magnitude of force is expressed in mass times length times time squared. The most common metric unit is the newton (N), which is defined as one kilogram times one meter over one second squared.

Thus, option C is correct.

To learn more about the magnitude of a force, follow the link;

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Answer:

When the big power lines are down, electricity is going through the ground and up you bike to the handles, so when yo touch it, you are electrocuted

Explanation:

Answer:

Helium is nonmetal

Explanation:

At immense pressures (such as what exists in the center of gas giant planets like Jupiter and Saturn), both Helium and Hydrogen enter a metallic state, where both will conduct electricity. Helium turns into a liquid metal similar to Mercury. So, helium can be a metal.

Answer:

If the length of a wire is doubled the resistance is shortened if it is thicker is is more durable due to the electrons having more room to spread out and flow through the wire

I hope this will help you

Answer:

C. Magnesium, Strontium, and barium

These four elements are in the same group or family. They are in the alkaline earth metals.

Answer:

Explanation:

Answer:

B

Explanation:

Answer:

Cohesion

Explanation:

Depending on how attracted molecules of the same substance are to one another, the substance will be more or less cohesive. Hydrogen bonds cause water to be exceptionally attracted to each other. Therefore, water is very cohesive.

Answer:

343

Explanation: