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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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jarptica [38.1K]

Answer:

The group number in the periodic table represents number of valence electrons of the elements in a certain group.

Explanation:

There are s, p, d, and f blocks, which you can see in periodic table

The s-block and p-block together are usually considered main-group elements, the d-block corresponds to the transition metals, and the f-block encompasses nearly all of the lanthanides (like lanthanum) and the actinides (like actinium)

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Hope this helps!

4 0
3 years ago
Which is NOT an assumption of matter made by the kinetic molecular theory of gases?
sertanlavr [38]

Answer:

a. the Kinetic energy of particles is determined by their mass and their velocity.

6 0
3 years ago
245 g water sample initially at at 32 oC absorbs 17 kcal of heat. What is the final temperature of water?
steposvetlana [31]

Answer:62.66°C or 235.66K

Explanation:Q=McpT, the energy was given in calories so you first convert to Joules by multiplying the value in calories by 4.184J.

17*4.184=71.128kJ.

71.128kJ=mcpT

71.128kJ=245*4.187*(T-Tm)

Tm is the final temperature of the mixture. The T is the temperature given which should be converted to Kelvin by adding 273...T=32+273=305K.

71128J=245*4.187*(305-Tm)

71128=312873.575-1025.815Tm

1025.815Tm=312873.575-71128

1025.815Tm=241745.58

Tm=241745.58/1025.815

Tm=235.66K

4 0
3 years ago
Balance this equation: Al+ HNO3 ---- H2 + Al(NO3)3​
romanna [79]

Answer:

2Al+ 6HNO3 ---- 3H2 + 2Al(NO3)3​

Explanation:

Put coefficient a,b,c, and d for calculation:

a Al + b HNO3 = c H2 + d Al(NO3)3

for Al: a = d

for H: b = 2c

for N: b = 3d

for O: 3b = 9d

Suppose a=1, then d=1, b=3, c=3/2

multiply 2 to make all natural number, a=2, then b=6, c=3, d=2

6 0
3 years ago
How many grams of glucose are needed to prepare 400. g of a 2.00% (m/m) glucose solution g?
Dominik [7]
The grams   of glucose  are  needed  to  prepare  400g  of  a 2.00%(m/m)  glucose  solution  g  is  calculated  as  below

=% m/m =mass  of the solute/mass  of  the  solution  x100

let mass of   solute  be represented  by  y
mass  of solution = 400 g
 % (m/m) = 2% = 2/100

 grams  of  glucose  is  therefore =2/100 =  y/400
by cross  multiplication

100y = 800
divide   both side  by  100

y= 8.0 grams



5 0
3 years ago
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