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masya89 [10]
3 years ago
8

7. Although carbon's three isotopes are carbon-12, carbon-13, and carbon-14, its

Chemistry
1 answer:
Naddik [55]3 years ago
4 0

Answer:

B

Explanation:

carbon 12 is most useful to humans

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<span>0.496 g of NaOH required 3 pellets. First, determine the molar mass of NaOH. Atomic weight sodium = 22.989769 Atomic weight hydrogen = 22.989769 Atomic weight oxygen = 15.999 Molar mass NaOH = 22.989769 + 22.989769 + 15.999 = 61.978538 g/mol Now determine how many moles of NaOH we need. Multiply desired volume by desired molarity. So 0.200 l * 0.040 mol/l= 0.008 mol To get the mass, then multiply by the molar mass, so 0.008 mol * 61.978538 g/mol = 0.495828304 g Since we have the NaOH in pellet form, divide the desired mass by the mass of each pellet. So 0.495828304 g / 0.170 g/pellet = 2.916637082 pellets You'll need 3 pellets. To get closer to the desired molarity, I would recommend increasing the amount of solution being prepared if you can accurately measure the larger volume.</span>
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Answer:

when it reduces heat.

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The__ contains all the elements l, arranged according to similarities in their properties​
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Which of these forces is acting on a baseball sitting on level ground? A. applied force B. frictional force C. gravitational for
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Read 2 more answers
How many hydrogen grams can be obtained if
kipiarov [429]

hi im breanna

Answer:

The mole is simply a very large number that is used by chemists as a unit of measurement.

Explanation:

The mole is simply a very large number,  

6.022

×

10

23

, that has a special property. If I have  

6.022

×

10

23

hydrogen atoms, I have a mass of 1 gram of hydrogen atoms . If I have  

6.022

×

10

23

 

H

2

molecules, I have a mass of 2 gram of hydrogen molecules. If I have  

6.022

×

10

23

 

C

atoms, I have (approximately!) 12 grams.

The mole is thus the link between the micro world of atoms and molecules, and the macro world of grams and litres, the which we can easily measure by mass or volume. The masses for a mole of each element are given on the periodic table as the atomic weight. So, if have 12 g of  

C

, I know, fairly precisely, how many atoms of carbon I have. Given this quantity, I know how many molecules of  

O

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