Answer:
M = 0.1825 M
Explanation:
To do this, let's write the equation again:
Na₂CO₃ + H₂SO₄ ---------> H₂O + CO₂ + Na₂SO₄
As we can see, the equation is already balanced and we can also see that the mole ratio between the acid and the carbonate is 1:1, this means that the moles of the acid, would be the same moles of the carbonate, therefore, we can use the following expression:
M₁V₁ = M₂V₂ (1)
1: Is the carbonate
2: is the acid
To get the concentration of the acid, we need to calculate the moles of the carbonate used. This can be done using the molecular mass of the sodium carbonate, which is 105.9888 g/mol, so the moles:
n₁ = 0.512 / 105.9888 = 0.0048 moles
Now that we have the moles, we can use (1) and calculate the concentration of the acid.
We know that:
n₁ = M₁V₁ (2)
Replacing in (1) we have:
n₁ = M₂V₂
M₂ = n₁ / V₂ (3)
Now all we have to do is replace the values and solve for the concentration:
M₂ = 0.0048 / (0.02630)
<h2>
M₂ = 0.1825 M</h2><h2>
This is the concentration (molarity) of the H₂SO₄</h2>
Answer:
104.969 amu.
Explanation:
From the question given above, the following data were obtained:
Isotope A:
Mass of A = 107.977 amu
Abundance (A%) = 0.1620%
Isotope B:
Mass of B = 106.976 amu
Abundance (B%) = 1.568%
Isotope C:
Mass of C = 105.974 amu
Abundance (C%) = 47.14%
Isotope D:
Mass of D = 103.973 amu
Abundance (D%) = 51.13%
Average atomic mass =?
The average atomic mass of the element can be obtained as follow:
Average atomic mass = [(Mass of A × A%) /100] + [(Mass of B × B%) /100] + [(Mass of C × C%) /100] + [(Mass of D × D%) /100]
Average atomic mass = [(107.977 × 0.1620)/100] + [(106.976 × 1.568)/100] + [(105.974 × 47.14)/100] + [(103.973 × 51.13)/100]
= 0.175 + 1.677 + 49.956 + 53.161
= 104.969 amu
Therefore, the average atomic mass of the element is 104.969 amu.
The correct answer of the given question above would be option C. Carbon dioxide absorbs the most heat energy during sublimation. It is the<span> transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase. Hope this answers your question.</span>
Base is Ca(OH)2.
Acid is H3PO4.
First part of the salt comes from base,
second par comes from the acid.
That is called condensation
