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telo118 [61]
3 years ago
12

URGENT PLEASE ANSWER

Chemistry
1 answer:
Alona [7]3 years ago
5 0

Answer:

1. nucleus

2.14

3.14

4.3

5. 4+ or 4-

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Valproic acid, used to treat seizures and bipolar disorder, is composed of C, H, and O. A 0.165-g sample is combusted to produce
sergeinik [125]

Answer:

The empirical formula is = C_4H_8O

The formula of Valproic acid = C_8H_{16}O_2

Explanation:

Mass of water obtained = 0.166 g

Molar mass of water = 18 g/mol

Moles of H_2O = 0.166 g /18 g/mol = 0.00922 moles

2 moles of hydrogen atoms are present in 1 mole of water. So,

<u>Moles of H = 2 x 0.00922 = 0.01844 moles </u>

Molar mass of H atom = 1.008 g/mol

<u>Mass of H in molecule = 0.01844 x 1.008 = 0.018588 g </u>

Mass of carbon dioxide obtained = 0.403 g

Molar mass of carbon dioxide = 44.01 g/mol

Moles of CO_2 = 0.403 g  /44.01 g/mol = 0.009157 moles

1 mole of carbon atoms are present in 1 mole of carbon dioxide. So,

<u>Moles of C = 0.009157 moles </u>

Molar mass of C atom = 12.0107 g/mol

<u>Mass of C in molecule = 0.009157 x 12.0107 = 0.11 g </u>

<u>Given that the Valproic acid only contains hydrogen, oxygen and carbon. </u>So,

Mass of O in the sample = Total mass - Mass of C  - Mass of H

Mass of the sample = 0.165 g

<u>Mass of O in sample = 0.165 - 0.11 - 0.018588 = 0.036412 g  </u>

Molar mass of O = 15.999 g/mol

<u>Moles of O  = 0.036412  / 15.999  = 0.002276 moles</u>

<u></u>

<u>Taking the simplest ratio for H, O and C as: </u>

<u>0.01844 : 0.002276 : 0.009157</u>

<u> = 8 : 1 : 4</u>

The empirical formula is = C_4H_8O

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 = 4×12 + 8×1 + 16= 72 g/mol

Molar mass = 144 g/mol

So,  

Molecular mass = n × Empirical mass

144 = n × 72

<u>⇒ n = 2</u>

The formula of Valproic acid = C_8H_{16}O_2

7 0
3 years ago
PLEASE ANSWER ASAP.id really appreciate it .Do metalloids have low or high density?
emmasim [6.3K]
Metalloids have a high density. 
7 0
3 years ago
Read 2 more answers
a 45 gram marble is dropped into a graduated cylinder with 30ml of water. The water level increases to 45.0 ml. What is the dens
Lady bird [3.3K]

Answer:

<h2>3 g/mL</h2>

Explanation:

The density of a substance can be found by using the formula

density =  \frac{mass}{volume}\\

From the question we have

volume = final volume of water - initial volume of water

volume = 45 - 30 = 15 ml

We have

density =  \frac{45}{15}  = 3 \\

We have the final answer as

<h3>3 g/mL</h3>

Hope this helps you

5 0
3 years ago
How is kilo gram is related to gram​
Levart [38]

Answer:

i know you think that they are just related because kg has kilo but they are related because

Explanation:

1000g makes 1 g.You see how much there is a difference in the solution because how is one=one thousand,well that is all i can help you from here.bye panta

4 0
3 years ago
Read 2 more answers
The atoms, molecules, or compounds formed in the reaction.
Inessa05 [86]
This defines the products, as they are formed in the reaction
7 0
3 years ago
Read 2 more answers
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