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Reika [66]
3 years ago
9

What is the mass number of an atom that has 12 neutrons and 11 protons?

Chemistry
2 answers:
TiliK225 [7]3 years ago
8 0

Answer:

23

Explanation:

Tamiku [17]3 years ago
5 0
Mass number = protons + neutrons. 12 + 11 = 23.
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How many moles of O2 are produced when 0.425 mol of KO2 reacts in this fashion
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The chemical reaction is expressed as:

<span> 4KO2+2CO2→2K2CO3+3O2 
</span>
We are given the amount of KO2 to be used in the reaction. This will be the starting point of our calculations. We do as follows:

0.425 mol KO2 ( 3 mol O2 / 4 mol KO2 ) = 0.319 mol O2 produced

Hope this answers the question. Have a nice day.
4 0
3 years ago
Covalent bonding is important between atoms of biological molecules, but other factors are important for self-assembly. For exam
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1. Polar

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3 years ago
2.56 g of hydrogen reacts completely with 20.32 g of oxygen<br> to form X g of water. X = g
Brilliant_brown [7]

Answer:

Mass of water produced is 22.86 g.

Explanation:

Given data:

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Mass of oxygen = 20.32 g

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2H₂ + O₂   →  2H₂O

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Now we will compare the moles of water with oxygen and hydrogen.

                    O₂            :            H₂O

                     1              :             2

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                    2              :              2

                 1.28            :           1.28

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Mass of water produced:

Mass = number of moles × molar mass

Mass = 1.27 × 18 g/mol

Mass = 22.86 g

 

4 0
3 years ago
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