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3 years ago

State the trend, at standard pressure, of the boiling points of these

Chemistry

1 answer:

pishuonlain [190]3 years ago

3 0

Can you add on a picture so that i can help you answer this question

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An organism from the past that is related to all the organisms in the group is called?

Drupady [299]

Answer:

Phylogeny

Explanation:

In shorter words

7 0

3 years ago

A hydrocarbon is burnt completely to give 3.447g of

goblinko [34]

Answer: The empirical formula for the given compound is $CH_2$

Explanation:

The chemical equation for the combustion of compound having carbon, hydrogen, iron and oxygen follows:

$C_xH_y+O_2\rightarrow CO_2+H_2O$

where, 'x' and 'y' are the subscripts of carbon and hydrogen respectively.

We are given:

Mass of $CO_2=3.447g$

Mass of $H_2O=1.647g$

We know that:

Molar mass of carbon dioxide = 44 g/mol

Molar mass of water = 18 g/mol

For calculating the mass of carbon:

In 44g of carbon dioxide, 12 g of carbon is contained.

So, in 3.447 g of carbon dioxide, $\frac{12}{44}\times 3.447=0.940g$ of carbon will be contained.

For calculating the mass of hydrogen:

In 18g of water, 2 g of hydrogen is contained.

So, in 1.647 g of water, $\frac{2}{18}\times 1.647=0.183g$ of hydrogen will be contained.

To formulate the empirical formula, we need to follow some steps:

Step 1: Converting the given masses into moles.

Moles of Carbon = $\frac{\text{Given mass of Carbon}}{\text{Molar mass of Carbon}}=\frac{0.940g}{12g/mole}=0.0783moles$

Moles of Hydrogen = $\frac{\text{Given mass of Hydrogen}}{\text{Molar mass of Hydrogen}}=\frac{0.183g}{1g/mole}=0.183moles$

Step 2: Calculating the mole ratio of the given elements.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.0783 moles.

For Carbon = $\frac{0.0783}{0.0783}=1$

For Hydrogen = $\frac{0.183}{0.0783}=2.34\approx 2$

Step 3: Taking the mole ratio as their subscripts.

The ratio of C : H = 1 : 2

Hence, the empirical formula for the given compound is $CH_2$

8 0

4 years ago

Potassium and bromine combine to make KBr. What is the name of this compound?

makkiz [27]

The name is Potassium bromide.

4 0

3 years ago

Read 2 more answers

In the electron dot notation Be:, the two dots represent valence electrons in the s sublevel. True False

krek1111 [17]

True

Explanation:

In the electron dot notation, the two dots on Be represents valence electrons in the s-sublevel.

The electron dot notation is also known as lewis dot structure.

This notation shows only the chemical symbol surrounded by dots to represent the valence electrons.

The dots are arranged at the four sides of the symbol in pairs called lone pairs. The unpaired ones are the odd electrons.

For Be, the structure is 1s² 2s²

The 2s sublevel is in the outermost/valence shell and it is made up of two electrons.

It is correct to say that the two dots on Be denotes the valence electrons in the s-sublevel.

learn more:

Lewis structure brainly.com/question/6215269

#learnwithbrainly

6 0

3 years ago

2. What is the mass of one mole of Na?

borishaifa [10]

Sodium, Atomic mass: 22.989769 g
You can see in a periodic table

5 0

3 years ago