Study the solutions in the glasses. Put the solutions in order from concentrated to dilute.A.
1, 2, 3

B.
1, 3, 2

C.
3, 1, 2

D.
2, 3, 1

Answers

Answer 1

Answer: A. 1,2,3. The solutions are getting lighter meaning the concentration is decreasing. Its most likely that water was added to dilute the solutions.

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Is ammonia a compound or an element?

Answers

a ammonia is a compound

How is the mass of 1 mole of an element determined

Answers

According to the concept of Avogadro's number there are 6.023×10²³ elementary entities in an element which when multiplied by atomic mass gives the mass of 1 mole of an element.

What is Avogadro's number?

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number.

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One mole (abbreviated mol) is equal to 6.022×1023 molecular entities (Avogadro's number), and each element has a different molar mass depending on the weight of 6.022×1023 of its atoms (1 mole). The molar mass of any element can be determined by finding the atomic mass of the element on the periodic table.

For the Haber process,N2+3H2 yields 2NH3, what volume of Nitrogen is consumed at STP if you collect 44.8 L of ammonia in excess hydrogen (N=14 AMU, H=1 AMU)a. 14.9 L
b. 29.9 L
c. 44.8L
d. 22.4 L

Answers

Answer: d. 22.4 L

Explanation:

$N_2+3H_2\rightarrow 2NH_3$

According to Avogadro's law , 1 mole of every gas occupies 22.4 L of volume at STP.

moles of ammonia= $\frac{\text {given volume}}{\text {Standard Volume}}=(44.8)/(22.4)=2moles$

Given: Hydrogen is the excess reagent and nitrogen is the limiting reagent as it limits the formation of product.

From the given balanced equation:

2 moles of ammonia is produced by 1 mole of nitrogen.

Thus 2 moles of ammonia is produced by 22.4 L of nitrogen at STP as 1 mole of nitrogen occupies 22.4 L at STP.

Water has a high (blank) which causes it to heat very slowly

Answers

boiling point... i'm pretty sure

Calculate the mass in grams of a sample of Americium containing six atoms

Answers

Answer: $243* 10^(-23)$ grams

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023* 10^(23)$ of particles. and weighs equal to the molecular mass.

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given atoms}}{\text {Avogadro's number}}=(6)/(6.023* 10^(23))=1.0* 10^(-23)moles$

1 mole of Americium weighs = 243 g

Thus $1.0* 10^(-23)moles$ of Americium weigh= $(243)/(1)* 1.0* 10^(-23)=243* 10^(-23)g$

Thus the mass mass in grams of a sample of Americium containing six atoms is $243* 10^(-23)$

The mass (in grams) of the sample of Americium containing six atoms is 2.42×10⁻²¹ grams

How to determine the mass of Americium containing six atoms?

First, we shall obtain the mole of americium that contains six atoms. This is illustrated below:

From Avogadro's hypothesis,

6.022×10²³ atoms = 1 mole of americium

Therefore, we can say that

6 atoms = 6 / 6.022×10²³

= 9.96×10⁻²⁴ mole of americium

Finally, we shall determine the mass (in grams) of the americium. Details below:

Mole of americium = 255163.41 moles
Molar mass of americium = 243 g/mol
Mass of americium = ?

Mass of americium = Mole × molar mass

= 9.96×10⁻²⁴ × 243

= 2.42×10⁻²¹ grams

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