# How many atoms are present in a 1.0 mole sample of potassium perchlorate (KClO3)?

QUESTION POSTED AT 10/10/2019 - 09:38 AM

QUESTION POSTED AT 10/10/2019 - 09:38 AM

Okay, a mole of potassium perchlorate contains 6.02x1023 formula units of potassium perchlorate, but you're asking about individual atoms. So, let's look at the formula: KClO3. That's 1 potassium, 1 chlorine, and 3 oxygens, for a total of 5 atoms per formula unit. Now, multiple 5 by Avogadro's number above, to get 30.1x1023, which simplifies to 3.01x1024 atoms.

A.) because it turns from paper to ashes

ANSWERED AT 17/10/2019 - 09:10 AM

QUESTION POSTED AT 17/10/2019 - 09:10 AM

A. It is changing state, color. Etc.

ANSWERED AT 17/10/2019 - 09:09 AM

QUESTION POSTED AT 17/10/2019 - 09:09 AM

To solve this we assume that the gas is an ideal gas. Then, we can use the ideal gas equation which is expressed as PV = nRT. At a constant temperature and number of moles of the gas the product of PV is equal to some constant. At another set of condition of temperature, the constant is still the same. Calculations are as follows:

P1V1 =P2V2

P2 = P1 x V1 / V2

P2 = 503 x 648 / 216

**P2 =1509 kPa**

ANSWERED AT 17/10/2019 - 09:06 AM

QUESTION POSTED AT 17/10/2019 - 09:06 AM

the answer is A!!!! why cant some of you ppl just put the letter

ANSWERED AT 17/10/2019 - 09:02 AM

QUESTION POSTED AT 17/10/2019 - 09:02 AM

Yes, because mechanical waves require an initial energy input, and without a medium energy cannot travel.

ANSWERED AT 17/10/2019 - 09:01 AM

QUESTION POSTED AT 17/10/2019 - 09:01 AM

It would be atomic mass units, or amus, if I remember correctly.

ANSWERED AT 17/10/2019 - 08:51 AM

QUESTION POSTED AT 17/10/2019 - 08:51 AM

The answer is true hope it helped

ANSWERED AT 17/10/2019 - 08:49 AM

QUESTION POSTED AT 17/10/2019 - 08:49 AM

4 mol / 205g H2O = 4/.205 = 19.5 mol/kg boiling point = 100 + 19.5 • 0.51 = 109 ºC

ANSWERED AT 17/10/2019 - 08:33 AM

QUESTION POSTED AT 17/10/2019 - 08:33 AM

The second choice, the atomic number plus the number of neutrons equals the atomic mass.

ANSWERED AT 17/10/2019 - 08:06 AM

QUESTION POSTED AT 17/10/2019 - 08:06 AM

Any options?????????

ANSWERED AT 17/10/2019 - 08:02 AM

QUESTION POSTED AT 17/10/2019 - 08:02 AM

I think the answer is A. They observed the way the elements looked

ANSWERED AT 17/10/2019 - 07:42 AM

QUESTION POSTED AT 17/10/2019 - 07:42 AM

The answer:

The equation of its dissolution in water is: AgNO3 → Ag + (aq) + NO3- (aq)

and AgNO3 → Ag + (aq) + NO3- (aq)

1 mol 1mol 1mol

? -------- 0.854mo

so for finding the value, it is sufficients to complute 1 x 0.854 mol =0.854 mol

so, 0.854 mol is required for the reaction to form 0.854 mol of Ag

The equation of its dissolution in water is: AgNO3 → Ag + (aq) + NO3- (aq)

and AgNO3 → Ag + (aq) + NO3- (aq)

1 mol 1mol 1mol

? -------- 0.854mo

so for finding the value, it is sufficients to complute 1 x 0.854 mol =0.854 mol

so, 0.854 mol is required for the reaction to form 0.854 mol of Ag

ANSWERED AT 17/10/2019 - 07:41 AM

QUESTION POSTED AT 17/10/2019 - 07:41 AM

It would be 10% concentrated, not 100%

**the statement is false**

ANSWERED AT 17/10/2019 - 07:22 AM

QUESTION POSTED AT 17/10/2019 - 07:22 AM

6.2 is the answer friends

ANSWERED AT 17/10/2019 - 07:15 AM

QUESTION POSTED AT 17/10/2019 - 07:15 AM

The solubility product of a substance us calculated by the product of the concentration of the dissociated ions in the solution raise to the stoichiometric coefficient of the ions. Therefore, we need the dissociation reaction. For this, it will have the reaction:

PbI2 = Pb^2+ + 2I-

We solve as follows:

Ksp = [Pb2+][I-]^2 = 1.4 x 10-8

1.4 x 10-8 = x(2x)^2

1.4 x 10-8 = 4x^3

x = 1.5x10^-3 M

The molar solubility would be 1.5x10^-3 M.

PbI2 = Pb^2+ + 2I-

We solve as follows:

Ksp = [Pb2+][I-]^2 = 1.4 x 10-8

1.4 x 10-8 = x(2x)^2

1.4 x 10-8 = 4x^3

x = 1.5x10^-3 M

The molar solubility would be 1.5x10^-3 M.

ANSWERED AT 17/10/2019 - 06:30 AM

QUESTION POSTED AT 17/10/2019 - 06:30 AM

The correct answer is A. Glass does not have an orderly arrangement of the atoms, like the minerals. Glass lacks a crystal lattice structure, and is an amorphous solid. The atoms of glass are rigidly fixed but are arranged in an orderly fashion.

ANSWERED AT 17/10/2019 - 06:17 AM

QUESTION POSTED AT 17/10/2019 - 06:17 AM

As you go down a group on the periodic table, atomic radii tend to increase because elements with larger atomic numbers have more occupied electron levels which take up more space surrounding the nucleus.

I hope this helps.

I hope this helps.

ANSWERED AT 17/10/2019 - 05:59 AM

QUESTION POSTED AT 17/10/2019 - 05:59 AM

The pressure will increase.

ANSWERED AT 17/10/2019 - 05:43 AM

QUESTION POSTED AT 17/10/2019 - 05:43 AM

Three. A ketone is a carbonyl compound, meaning there is a carbon oxygen double bond. A ketone is different from an aldehyde as an aldehyde has this C=O at the end of the molecule, while a ketone is on the inside. Thus, there must be a non-terminal carbon for there to be a ketone, and so three carbons are required (minimum), with the C=O at carbon 2.

ANSWERED AT 17/10/2019 - 05:42 AM

QUESTION POSTED AT 17/10/2019 - 05:42 AM

**Answer: Option (a) is the correct answer.**

**Explanation:**

A bond that is formed because of transfer of electrons from one atom to another is known as an ionic bond.

For example, sodium has 1 valence electron and chlorine has 7 valence electrons. So, transfer of one electron from sodium to chlorine will result in an ionic bond leading to the formation of compound NaCl.

Also, there is large difference in electronegativities of a metal and a non-metal. Usually, a metal and a non-metal form an ionic bond.

On the other hand, a bond formed by sharing of electrons is known as a covalent bond.

For example, molecule has covalent bond.

Hence, we can conclude that **bonding atoms that experience large differences in electronegativity values will experience ionic bond.**

ANSWERED AT 17/10/2019 - 05:40 AM

QUESTION POSTED AT 17/10/2019 - 05:40 AM

Now in total the ion has 27 electrons, 30 protons and 35 neutrons

ANSWERED AT 17/10/2019 - 05:34 AM

QUESTION POSTED AT 17/10/2019 - 05:34 AM

So the atomic number of an element tells the number of proton in the element.

The atomic mass is the sum of the number of protons and neutrons.

From this we can draw up and equation:

Atomic Mass = (# of protons) + (# of neutrons)

⇒ # of neutrons = Atomic Mass - Atomic Number

= 14 - 7

= 7

Therefore nitrogen has**SEVEN** neutrons.

The atomic mass is the sum of the number of protons and neutrons.

From this we can draw up and equation:

Atomic Mass = (# of protons) + (# of neutrons)

⇒ # of neutrons = Atomic Mass - Atomic Number

= 14 - 7

= 7

Therefore nitrogen has

ANSWERED AT 17/10/2019 - 05:34 AM

QUESTION POSTED AT 17/10/2019 - 05:34 AM

Molarity is expressed as the number of moles of solute per volume of the solution. For example, we are given a solution of 2M NaOH this describes a solution that has 2 moles of NaOH per 1 L volume of the solution. To calculate the moles of NaCl in 1.0 M of solution, we simply multiply the volume given of the solution.

moles NaCl = 1.0 M (0.100 L ) = 0.10 mol NaCl --------> OPTION B

moles NaCl = 1.0 M (0.100 L ) = 0.10 mol NaCl --------> OPTION B

ANSWERED AT 17/10/2019 - 05:33 AM

QUESTION POSTED AT 17/10/2019 - 05:33 AM

phase change

happened

ANSWERED AT 17/10/2019 - 05:32 AM

QUESTION POSTED AT 17/10/2019 - 05:32 AM

She should dissolve it in water and test conductivity. If it conducts electricity it is an ionic compound.

ANSWERED AT 17/10/2019 - 05:29 AM

QUESTION POSTED AT 17/10/2019 - 05:29 AM

To the right of calcium and in the same period.

ANSWERED AT 17/10/2019 - 05:28 AM

QUESTION POSTED AT 17/10/2019 - 05:28 AM

The first step is to **balance the equation:**

**C3H8 + 5O2 ---> 3CO2 + 4H2O **

Check the balance

element left side right side

C 3 3

H 8 4*2 = 8

O 5*2=10 3*2 + 4 = 10

Then you have the**molar ratios:**

**3 mol C3H8 : 5 mol O2 : 3 mol CO2 : 4 mol H2O**

Now you have 40 moles of O2 so you make the**proportion:**

**40.0 mol O2 * [3 mol CO2 / 5 mol O2] = 24.0 mol CO2.**

**Answer: option D. 24.0 mol CO2 **

Check the balance

element left side right side

C 3 3

H 8 4*2 = 8

O 5*2=10 3*2 + 4 = 10

Then you have the

Now you have 40 moles of O2 so you make the

ANSWERED AT 17/10/2019 - 05:22 AM

QUESTION POSTED AT 17/10/2019 - 05:22 AM

.85 moles is the answer

ANSWERED AT 17/10/2019 - 05:14 AM

QUESTION POSTED AT 17/10/2019 - 05:14 AM

The new volume is 41 mL.

Explanation:

Use the combined gas law

P

1

V

1

T

1

=

P

2

V

2

T

2

.

STP=273.15 K and 1 atm

Given/Known

P

1

=

0.90 atm

V

1

=

50.0 mL

T

1

=

298 K

P

2

=

1 atm

T

2

=

273.15 K

Unknown

V

2

Solution

Rearrange the equation to isolate

V

2

and solve.

P

1

V

1

T

1

=

P

2

V

2

T

2

V

2

=

P

1

V

1

T

2

T

1

P

2

V

2

=

0.90

atm

×

50.0

mL

×

273.15

K

298

K

×

1

atm

=

41 mL

Explanation:

Use the combined gas law

P

1

V

1

T

1

=

P

2

V

2

T

2

.

STP=273.15 K and 1 atm

Given/Known

P

1

=

0.90 atm

V

1

=

50.0 mL

T

1

=

298 K

P

2

=

1 atm

T

2

=

273.15 K

Unknown

V

2

Solution

Rearrange the equation to isolate

V

2

and solve.

P

1

V

1

T

1

=

P

2

V

2

T

2

V

2

=

P

1

V

1

T

2

T

1

P

2

V

2

=

0.90

atm

×

50.0

mL

×

273.15

K

298

K

×

1

atm

=

41 mL

ANSWERED AT 17/10/2019 - 05:10 AM

QUESTION POSTED AT 17/10/2019 - 05:10 AM

**Answer:**

83.2%

**Explanation:**

Percent yield is the ratio of actual yield to the theoretical yield.

Percent yield = actual yield/ theoretical yield x 100

Moles of CO₂ = 0.184 mol

Molar mass of CO₂ = 44 g/mol

Mass of CO₂ = 0.814 mol x 44 g/mol = 35.816 g

Actual yield = 29.8 g

Theoretical yield = 35.816 g

Percent yield = 29.8 g/ 35.816 g x 100 = 83.2%

ANSWERED AT 17/10/2019 - 05:08 AM

QUESTION POSTED AT 17/10/2019 - 05:08 AM