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Natasha2012 [34]
4 years ago
9

Need help 1/6 + 1/8 =

Chemistry
1 answer:
pogonyaev4 years ago
6 0

1/6 + 1/8 = 7/24

24

≅ 0.2916667

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alculate the standard enthalpy of formation of ethanoic acid given that the standard enthalpy of combustion for carbon is –394 k
agasfer [191]

Answer:

The standard enthalpy of formation of ethanoic acid is -484 kJ/mol.

Explanation:

C(g)+O_2(g)\rightarrow CO_2(g),\Delta H_{1, comb}=-394 kJ/mol...[1]

H_2(g)+\frac{1}{2}O_2(g)\rightarrow H_2O(l),\Delta H_{2, comb}=-286 kJ/mol..[2]

CH_3COOH(l)+2O_2(g)\rightarrow 2CO_2(g)+2H_2O(l),\Delta H_{3, comb}=-876 kJ/mol..[3]

The standard enthalpy of formation of ethanoic acid :

2C(g)+2H_2(g)+O_2(g)\rightarrow CH_3COOH, \Delta H_{4}=?..[4]

Using Hess's law to calculate :

2 × [1] + 2 × [2] - [3] = [4]

\Delta H_4=2\times (-394 kJ/mol)+2\times (-286 kJ/mol) - (-876 kJ/mol)

=\Delta H_4=-484 kJ/mol

The standard enthalpy of formation of ethanoic acid is -484 kJ/mol.

5 0
3 years ago
Three grams of the same substance in different phases are stored in three different containers. Each container is barely large e
jenyasd209 [6]
The correct option is this: THE ATOMS IN THE SOLID WILL BE VIBRATING IN POSITION.
This is because the molecules in solids are held together by strong inter molecular forces, the molecules can not move about freely but they cab  vibrate in their position.
4 0
3 years ago
Read 2 more answers
Match each item to its proper disposal method. Answers to be used more than once.
salantis [7]

Answer:

1. a)

2. a)

3. b)

4. d)

Explanation:

The disposal method is how we throw away the wastes. In a chemical lab, the correct disposal method guarantees the security of the environment and the humans and animals that may be in contact with the materials.

So:

1. Excess chemical: Because it can be toxic, it may be disposed of in the appropriate waste container, which will depend on the characteristics of the material;

2. Reaction mixture: As the excess chemical, it can be toxic, so it must be disposed of at an appropriate waste container;

3. Used filter paper: Generally, the solids in the filter paper is not toxic, so it can be thrown away in the trash can;

4. Cracked or chipped beaker: Because the beaker is made of glass, it can cut when broken, so it must go to a broken glass box, that will protect the people that will deal with it.

8 0
3 years ago
What+is+the+molar+absorptivity+of+a+solute+that+absorbs+86%+of+a+certain+wavelength+of+light+when+the+beam+passes+through+a+1.0-
Makovka662 [10]

The molar absorptivity is

Molar absorptivity is defined as the measure a compound's ability to absorb light of a specific wavelength. It is represented by the constant/symbol 'ε'.

The molar absorptivity is given by :

A  = εcl

where A is the absorbance

ε is the molar absorptivity

c is the molar concentration of the compound

and l is the path length

here, the molar concentration of the solution is 0.16 mol

and the path length is 1 cm

to find the molar absorptivity , one must know the absorbance of the material.

(To know more about Molar absorptivity : brainly.com/question/18130658)

8 0
2 years ago
Read 2 more answers
Which statement correctly describes diamond and graphite, which are different forms of solid carbon?
mart [117]
They differ in their molecular structures and properties.
5 0
3 years ago
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