Answers
The question is incomplete; part of the data required in the question are shown:
Theoretical Yield: 2.05 g salicylic acid x (180g aspirin/1 mol) x (1 mol/138 g salicylic acid) 2. Mass of filter paper 2.56 g 3. Mass of filter paper and aspirin 5.42 g 4. Mass of aspirin (3-2) g. Percent Yield [(4)/(1)] x 100
Answer:
107%
Explanation:
We can calculate the theoretical yield as shown;
2.05g salicylic acid × 180g aspirin/1mol × 1 mol/138g of salicylic acid
Theoretical yield= 2.67 g of aspirin
Actual yield of aspirin is obtained from the experimental data;
Mass aspirin + filter paper= 5.42 g
Mass of filter paper= 2.56 g
Mass of aspirin= 5.42 g -2.56 g = 2.86 g
Hence actual yield of aspirin = 2.86 g
Percentage yield = actual yield/theoretical yield × 100
Percentage yield = 2.86/2.67 ×100 = 107%
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Calculate the partial pressure of each gas and the total pressure if the temperature of the gas is 21 ∘C∘C. Express the pressures in atmospheres to three significant digits separated by commas.
Answers
Explanation:
Law of conservation of mass states that mass can neither be created nor it can be destroyed but it can be transformed into one form to another.
Similarly, law of conservation of energy states that energy can neither be created nor it can be destroyed as it can only be transformed from one form to another.
In modern view of matter and energy, is the law of mass conservation still relevant to chemical reactions as follows.
For example,
Atomic mass of Na = 23
Atomic mass of Cl = 35
Hence, mass of total number of reactants is calculated as follows.
[(2 \times 23) + (35 \times 2)] g/mol = 116 g/mol
Mass of total number of products is calculated as follows.
[2 \times (23 + 35)] = 116 g/mol
Thus, it is proved that in our modern view of matter and energy, is the law of mass conservation still relevant to chemical reactions.
Answers
When you fill a basin with liquid water, you can see that the water takes the shape of the container in which it is contained. This is because in the liquid state, water has molecules farther apart than in the solid state.
You can notice this property when performing an experiment with liquid and solid water.
When filling a glass, liquid water takes on the shape of a glass, and solid water, such as an ice cube, remains the same shape when placed in a glass.
Therefore, when filling a basin with water we perceive a property of the physicalstate of water, in liquid form. Water is one of the few substances that can be found naturally in liquid, solid and gaseous states.
Learn more here:
Answer:
Cautiously and avoiding filling in the central area so that it does not overflow when filling, since being very beach makes filling difficult.
Explanation:
The basins are shallow, that is why filling is difficult, the filling must be slow, low intensity and at the edges not placing the water filling in the center of the basin.
Answers
• Volume of the marshmallow:
V = 2.75 in^3 (but, 1 in^3 = 16.39 cm^3)
V = 2.75 × 16.39 cm^3
V = 2.75 × 16.39 cm^3
V = 45.0725 cm^3
• Density:
d = 0.242 g/cm^3
• Mass:
m = d × V
m = (0.242 g/cm^3) × (45.0725 cm^3)
m = (0.242 g/cm^3) × (45.0725 cm^3)
m = 10.907545 g
m ≈ 10.9 g <——— this is the answer.
I hope this helps. =)
Answer:
9.92g
Explanation:
2.50 in31×16.39 cm31 in3×0.242 gcm3=9.92 g
Answers
Both formed an ionic bond, due to the electrostatic charge of attraction between the 2 oppositely charged ions. If many ions of Ca and Br are present and numerous ionic bonds have formed it will undergo an arrangement which is that of an ionic lattice, type of structure.
Answers
The number of protons neutrons, and electrons in each of the following species given are below;
What is the atomic number?
The total number of protons present in an atom is known as the atomic number of that atom. The atomic number has no correlation either with the number of neutrons or the number of electrons present inside an atom.
15N7 ⇒ 7 electrons, 8 neutrons, 7 protons
33S16 ⇒ 16 protons, 16 electrons, 17 neutrons
63Cu29 ⇒ 29 electrons, 34 neutrons,29 protons
84Sr38 ⇒ 38 electrons, 46 neutrons,38 protons
130Ba56 ⇒ 56 electrons, 74 neutrons,56 protons
186W74⇒ 74 electrons, 112 neutrons,74 protons
202Hg80 ⇒ 80 electrons, 122 neutrons ,80 protons
To learn more about the atomic number from here, refer to the link ;
#SPJ2
Answer:
1. 7 protons, 7 electrons, 8 neutrons
2. 16 protons, 16 electrons, 17 neutrons
3. 29 protons, 29 electrons, 34 neutrons
4. 38 protons, 38 electrons, 46 neutrons
5. 56 protons, 56 electrons, 74 neutrons
6. 74 protons, 74 electrons, 112 neutrons
7. 80 protons, 80 electrons, 122 neutrons
single bonds
carboxylic groups
carbon chains