Response:
This is my understanding.
Explanation:
(g) Titration curves
While I can't create two curves on a single graph, I can depict them separately for clarity.
In part (d), the graph indicated an equivalence point at 20 mL.
For the second titration, since the NaOH concentration is doubled, the volume to reach the equivalence point will be halved — 10 mL.
Below are the two titration curves.
(h) Evidence of reaction
Both HCl and NaOH are colorless solutions.
There is no gas released or precipitate formed during their reaction.
It’s likely the student observed that the Erlenmeyer flask heated up, indicating a chemical change.
1.22 mg is equivalent to 0.022 grams. Since one gram contains 1000 mg, convert milligrams to grams by dividing by 1000. Calculate volume using mass divided by density: volume equals 0.022 grams divided by 0.754 grams/cm³, resulting in approximately 0.029 or 0.03 cm³. Additionally, weight in newtons equals the mass in kilograms multiplied by gravitational acceleration: weight equals 10 kg times 9.8 m/s², which is 98 newtons.
From our knowledge:
-Atomic Mass = Protons + Neutrons
-Atomic Number equates to protons
Magnesium possesses an atomic number of 12, indicating that its naturally occurring isotope is Mg-12 (with 12 protons and 12 neutrons). In total, the atomic mass amounts to 24 amu. If we add another neutron to create Mg-13, the atomic mass will be 25 amu.
We can express this situation mathematically:
(amu of isotope 1)x + (amu of isotope 2)(x-1) = Average atomic mass
Here, isotope 1 represents the fractional abundance we're determining.
When substituted, it looks as follows:
24x + 25(1-x) = 24.3
Now let’s solve for x:
24x + 25 - 25x = 24.3
-x + 25 = 24.3
-x = -0.7
x = 0.7
Thus, the fractional abundance of Mg-12 is 0.7, or 70%.<span />
Answer:
The right answer is "1.0100".
Explanation:
Assuming the total volume of the mixture is 100 ml.
Thus,
The volume of DMSO will be 10 mL and the volume of water will be 90 mL.
For DMSO:
= 
= 
The total mass of the mixture will be:
= 
= 
Calculating the density of the mixture:
= 
= 
= 
Thus,
The specific gravity of the mixture is:
= 
= 
= 
Answer:
1. 192.0 g/mol.
2. 84.0 g/mol.
Explanation:
- The molar mass refers to the weight of all atoms combined in a molecule measured in grams per mole.
- To find a molecule's molar mass, we begin by looking up the atomic weights of the relevant elements from the periodic table. Next, we tally the atoms present and multiply that by their respective atomic weights.
1. Molar mass of citric acid (C₆H₈O₇):
Molar mass of C₆H₈O₇ = 6(atomic mass of C) + 8(atomic mass of H) + 7(atomic mass of O) = 6(12.0 g/mol) + 8(1.0 g/mol) + 7(16.0 g/mol) = 192.0 g/mol.
2. Molar mass of baking soda (NaHCO₃):
Molar mass of NaHCO₃ = (atomic mass of Na) + (atomic mass of H) + (atomic mass of C) + 3(atomic mass of O) = (23.0 g/mol) + (1.0 g/mol) + (12.0 g/mol) + 3(16.0 g/mol) = 84.0 g/mol.
