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7nadin3 [17]
3 years ago
5

Formulae for calculating number of moles​

Chemistry
1 answer:
Tresset [83]3 years ago
4 0
You would use this number, 6.02×1023 (Avogadro's number) to convert from particles, atoms, or molecules to moles. Whenever you go to the mole, divide by Avogadro's number. When you go to the unit from moles, multiply by Avogadro's number.
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** worth 20 points + brainliest **
Bad White [126]

Answer : The correct option is, (D) 83^oC

Solution :

Formula used :

Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})

where,

Q = heat released = -1300 J

m = mass of water = 40 g

c = specific heat of water = 4.18J/g^oC      

\Delta T=\text{Change in temperature}  

T_{final} = final temperature = ?

T_{initial} = initial temperature = 91.0^oC

Now put all the given values in the above formula, we get the final temperature of water.

-1300J=40g\times 4.18J/g^oC\times (T_{final}-91.0^oC)

T_{final}=83.2^oC\approx 83^oC

Therefore, the final temperature of the water is, 83^oC

5 0
3 years ago
Help needed urgently<br>the word missing or partially seen is oxygen ​ I forgot to put more pointa
butalik [34]

Explanation:

2.04 % hydrogen

32.65% sulphur

65.31% is oxygen

atomic ratio

hydrogen =2.04÷1=2.04

sulphur =32.65÷32=1.02

oxygen =65.31÷16=4.08

simplest ratio

hydrogen = 2.04÷1.02=2

sulphur =1.02÷1.02=1

oxygen =4.08÷1.02=4

empirical formula is H2SO4

4 0
3 years ago
Silver is produced as a byproduct of gold
VashaNatasha [74]

Answer:

Element Properties

atomic number 47

atomic weight 107.868

melting point 960.8 °C (1,861.4 °F)

boiling point 2,212 °C (4,014 °F)

specific gravity 10.5 (20 °C [68 °F])

oxidation states +1, +2, +3

electron configuration [Kr]4d105s1

hope that helps

4 0
3 years ago
Please help me with chemistry
jok3333 [9.3K]
I will, I am in a chemistry class right now. What’s up?
8 0
3 years ago
Draw the organic product formed when the following compounds undergo a substitution reaction: (c) ethanoic acid and diethylamine
djyliett [7]

The organic product formed when the ethanoic acid and diethylamine compounds undergo a substitution reaction is N, N- diethyl ethanamide.

<h3>What is Substitution reaction? </h3>

Substitution reaction is a reaction in which one group substitute the functional group of another organic compound or it can also be defined as a reaction that involves the replacement of one atom or group of atoms of a compound with another atom or group of atom.

<h3>Types of Substitution reaction</h3>

Substitution Reactions are basically of two types:

nucleophilic reaction and electrophilic reactions. These two types of substitution reactions differ in the types of atom that is attached to its original molecule. In the nucleophilic reactions, the atom is electron-rich species, on the other hand, in the electrophilic reaction, the atom is an electron-deficient species.

Thus, we concluded that the organic product formed when the ethanoic acid and diethylamine compounds undergo a substitution reaction is N, N- diethyl ethanamide.

learn more about substitution reaction:

brainly.com/question/10143438

#SPJ4

3 0
2 years ago
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