The initial balanced equation of decomposition is:
2NaN3 —> 2Na + 3N2
Since 1 mole of a gas occupies 24dm^3 at room temperature and pressure:
72dm^3 / 24dm^3 = 3 moles of Nitrogen which required 2 moles of Sodium Azide.
Since moles = mass/Relative molecular mass or molar mass
2 moles x 65~ g/mol = 130g
For the empirical formula:
Element H N
% Mass 2.33% 97.7%
Mass/Mr 2.33 6.97
2.33 7~
Divide by lowest number
1 3
Therefore empirical formula is
H1N3
Answer:
The empirical formula of this substance is:
Explanation:
To find the empirical formula of this substance we need the molecular weight of the elements Carbon, Hydrogen and Oxygen, we can find this information in the periodic table:
- C: 12.01 g/mol
- H: 1.00 g/mol
- O: 15.99 g/mol
With the information in this exercise we can suppose in 100 g of the substance we have:
C: 48.64 g
H: 8.16 g
O: 43.2 g (100 g - 48.64g - 8.16g= 43.2 g)
Now, we need to divide these grams by the molecular weight:
We need to divide these results by the minor result, in this case O=2.70 mol
We need to find integer numbers to find the empirical formula, for this reason we multiply by 2:
This numbers are very close to integer numbers, so we can find the empirical formula as subscripts in the chemical formula:
Answer:
0.1818 M
Explanation:
For the process of titration , the formula we use is -
M₁V₁ = M₂V₂
Where ,
M₁ = initial concentration of the acid
V₁ = initial volume of the acid
M₂ = final concentration of the base
V₂ = final volume of the base
Hence , from the question ,
The given data is ,
M₁ = ?
V₁ = 43.5 mL
M₂ = 0.0906 M
V₂ = 87.3 mL
Now, to determine the unknown quantity , the formula can be applied ,
Hence ,
M₁V₁ = M₂V₂
Putting the respective values ,
? * 43.5 mL = 0.0906 M * 87.3 mL
solving the above equation ,
M₁ = ? = 0.1818 M
Answer:
well
Some materials do not allow the heat to flow through them and they are known as bad conductors of heat or heat insulators, The insulators are poor conductors of heat, The poor conductors are good insulators and they are materials that the heat can not travel through.
Explanation:
I Believe A is correct is correct because atoms are basically the building blocks of all type of matter, without atoms, there is no matter
B is correct as well because the amount protons of in an atom do define the element. E.g. There is 8 protons in an oxygen atom. oxygen is the 8th element on the periodic table.
C is incorrect because the atomic number is always different
D is incorrect as we already determined that Protons define the element
So A and B should be your answers
