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adell [148]
3 years ago
5

Nitrogen combines with oxygen to form nitrogen monoxide (no) and nitrogen dioxide (no2). a sample of no consists of 1.14 g of ox

ygen and 1 g of nitrogen. how many grams of oxygen combine with 1 g of nitrogen to form no2if the ratio of the masses of oxygen in these two compounds is exactly 1:2?
Chemistry
2 answers:
frez [133]3 years ago
6 0

<u>Answer:</u> The mass of oxygen that combines with nitrogen will be 2.272g.

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}   .....(1)

<u>For Oxygen atom:</u>

Given mass of oxygen atom = 1.14 g

Molar mass of oxygen atom = 16 g/mol

Putting values in above equation, we get:

\text{Moles of oxygen atom}=\frac{1.14g}{16g/mol}=0.071mol

<u>For Nitrogen atom:</u>

Given mass of nitrogen atom = 1 g

Molar mass of nitrogen atom = 14 g/mol

Putting values in above equation, we get:

\text{Moles of nitrogen atom}=\frac{1g}{14g/mol}=0.071mol

For the given chemical reaction:

2N_2+3O_2\rightarrow 2NO+2NO_2

In 1 mole of nitrogen dioxide molecule, 1 mole of nitrogen atom combines with 2 moles of oxygen atom.

So, 0.071 moles of nitrogen will combine with = \frac{2}{1}\times 0.071=0.142moles of oxygen atom.

Now, to calculate the mass of oxygen atom, we use equation 1:

0.142mol=\frac{\text{Mass of oxygen atom}}{16g/mol}\\\\\text{Mass of oxygen atom}=2.272g

Hence, the mass of oxygen that combines with nitrogen will be 2.272g.

Sever21 [200]3 years ago
4 0
2N2 + 3O2 ---> 2NO + 2NO2  
You should do it based on moles and not grams. 
1.14 g O = 0.071 moles O 
1 g N = 0.071 moles N  
So in NO2 you need 2 moles O for each mole of N 
1 g N = 0.071 moles, so you need 0.071 x 2 moles of O = 0.0.142 moles O 
0.142 moles O x 16 g/mol = 2.27 grams of O. So, you are actually correct because your answer is 2.28 grams. I just prefer to work it out in moles so it makes perfect chemical sense.
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<u>Ionic radius is the radius of an atom´s ion in ionic crystal structure</u>.<u> </u><u><em>In an ion that lose an electron, to form a cation, the radius of the ion gets smaller</em></u><em>, </em>because the repulsion between electrons decrease because fewer electrons are present. Conversely, <u><em>adding on electron to a neutral atom, to form an anion, causes electron - electron repulsions to increase, so the size of the radius of the ion gets bigger.</em></u>                  

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<u>We will use this principle to solve our problem</u>.  

In our case, the given ions are:  

  • N⁻³ :    Z = 7,  e⁻ = 10
  • O⁻²:     Z= 8,   e⁻ =10
  • F⁻:       Z = 9,  e⁻ = 10
  • Na⁺:    Z= 11,   e⁻ = 10
  • Mg⁺²:  Z=12,   e⁻ =10

where Z= number of protons, and e⁻ = number of electrons.

<em><u>Hence the decreasing order of ionic radius is:</u></em>

N⁻³ > O⁻² > F⁻ > Na⁺ > Mg⁺²  

Have a nice day!

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