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pickupchik [31]
3 years ago
9

How do u solve B please help

Chemistry
1 answer:
kakasveta [241]3 years ago
3 0
Need a better screenshot.
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A substance has twice the number of particles as 12 grams of carbon-12. How many
klasskru [66]

Answer:

D)2.0

Explanation:

Avogadro’s number represent the number of the constituent particles which are present in one mole of the substance. It is named after scientist Amedeo Avogadro and is denoted by N_0.

Also, it is the number of particles in exactly 12.000 g of isotope carbon 12.

Avogadro constant:-

N_a=6.023\times 10^{23}

Thus,

Number of particles as 12 grams of carbon-12 constitutes 1 mole

<u>Twice the number of particles as 12 grams of carbon-12 constitutes 1*2 mole</u>

Thus, moles in the substance = 2.0 moles

3 0
3 years ago
Aluminum has the electronic configuration 2,8,3. How many valence
Klio2033 [76]

Answer:

3 valence electrons

Explanation:

Because aluminum has three, that means three fluorines can bond. The make the formula AlF3, also known as aluminum trifluoride. Each of the fluorine atoms gets an electron to fill their shell, and the aluminum loses three, giving it a filled shell too (remember, aluminum has three extra electrons).

6 0
3 years ago
How much heat is released as the temperature of 465 g of water drops from 75.0°C to 18.2°C?
Aleks [24]

The heat released : -110560.632 J

<h3>Further explanation</h3>

Heat can be calculated using the formula:  

Q = mc∆T  

Q = heat, J  

m = mass, g  

c = specific heat, joules / g ° C  

∆T = temperature difference, ° C / K  

<h3>Known</h3>

m =465 g

c water = 4.186 J/gram °C

∆T = temperature difference = 18.2 - 75 = - 56.8 °C

Then the heat :

\tt Q=m.c.\Delta T\\\\Q=465\times 4.186\times -56.8\\\\Q=\boxed{\bold{-110560.632~J}}\rightarrow -=exothermic

3 0
4 years ago
Science can best be described as
Savatey [412]
A way of building knowledge about the world around us through observation and experimentation.
8 0
3 years ago
Which is the correct way to write 602,200,000,000,000,000,000,000 in scientific notation
serious [3.7K]
6.022 x 10^23
I answered this already :)
4 0
3 years ago
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