A 250-mL aqueous solution contains 1.56 mc025-1.jpg 10–5 g of methanol and has a density of 1.03 g/mL. What is the concentration in ppm?A 6.1 X 10^-8 ppm
B 1.5 X 1-^-5 ppm
C 0.061 ppm
D 15 ppm
Answers
Answer: The correct option is C.
Explanation: ppm is used to measure the concentration of solute in a given volume of solution. ppm is basically parts per million.
Mathematically,
We are given:
Mass of methanol = (Conversion Factor : 1g = 1000mg)
Volume of solution = 250 mL = 0.250L (Conversion Factor : 1L = 1000mL)
Putting values in above equation, we get:
Concentration of methanol = 0.062ppm
Hence, the correct option is C.
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How many molecules is 1.50 moles of CO2
Which is greater the area of a red plate diner has a radius of 6 cm or the area of two yellow plate with a radius of 3 cm each
The interaction of tectonic plate boundaries is associated with which of the following events? Hurricanes Tropical storms Earthquakes Tornados Previous Question
If an atom has six protons and four neutrons, what is its charge?
Answers
Nitrogen Molecule:
N₂ or :N≡N:
Cyanide Ion:
CN⁻ or [:C≡N:]⁻
Alkynes:
R-C≡C-R
Carbon Monoxide:
CO or :C≡O:
Among given compounds Alkynes belong to a class of unsaturated hydrocarbons. The carbon atom in alkyne is sp hybridized. These unsaturated hydrocarbons have their own characteristic chemical properties.
Final answer:
A compound with a triple bond, like acetylene, is a molecule where three pairs of electrons are shared between two atoms. Acetylene contains a triple bond between its two carbon atoms. These bonds are strong, robust, and render unique properties to the compound.
Explanation:
A compound that contains a triple bond is a molecule in which three pairs of electrons are shared between two atoms, making it a very strong connection. An example of such a compound is acetylene (C2H2), which contains a triple bond between the two carbon atoms. The presence of triple bonds results in substances with unique properties when compared to compounds with only single or double bonds.
The triple bond in acetylene is formed by one sigma bond and two pi bonds. This means that acetylene is a more robust compound because of the strength of the triple bond. Additionally, molecules with triple bonds often have interesting chemical reactivities which make them important in various fields such as organic chemistry or industrial synthesis.
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Answers
6 (1.00728 amu) + 6 (1.00866 amu) = x
6.04368 amu + 6.05196 amu = x
12.09564 amu = x
Then subtract it with 12 amu to get the defect mass
12.09564 amu - 12.00000 amu = y
0.09564 amu = y
So the defect mass would be 0.09564 amu.
1) The number of protons in an element defines its atomic number, and for carbon, it is 6. 2) Number of neutrons in a carbon-12 atom is 6. 3) The mass defect of a carbon-12 atom is 0.09564 amu.
To determine the number of protons and neutrons in a carbon-12 atom and the mass defect, we need to use the given atomic masses of a proton and a neutron.
Number of protons in a carbon-12 atom:
Carbon-12 is the most common isotope of carbon, and it contains 6 protons. The number of protons in an element defines its atomic number, and for carbon, it is 6.
Number of neutrons in a carbon-12 atom:
The mass number of an isotope will be the sum of protons as well as neutrons in its nucleus. For carbon-12, the mass number is 12 amu. Since we already know it has 6 protons, the number of neutrons can be calculated as follows:
Number of neutrons = Mass number-Number of protons
Number of neutrons = 12 amu-6 protons
Number of neutrons = 6 neutrons
Mass defect of a carbon-12 atom:
The mass defect is the difference between the actual mass of a nucleus and the sum of the masses of its individual protons and neutrons.
Mass defect = (Mass of protons + Mass of neutrons) - Actual mass of carbon-12
Mass of protons = 6 protons × 1.00728 amu/proton = 6.04368 amu
Mass of neutrons = 6 neutrons × 1.00866 amu/neutron = 6.05196 amu
Actual mass of carbon-12 = 12.00000 amu
Mass defect = (6.04368 amu + 6.05196 amu) - 12.00000 amu
Mass defect = 12.09564 amu - 12.00000 amu
Mass defect = 0.09564 amu
So, the mass defect of a carbon-12 atom is 0.09564 amu.
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HCl
BrF
NO2
Answers
Answer:
He
Step-by-step explanation:
A postulate of the Kinetic Molecular Theory is that at a given temperature, the average kinetic energy of the molecules is directly proportional to the Kelvin temperature.
KE = ½ mv² ∝ T
mv² ∝ T Divide each side by T
v² ∝ T/m
If T is constant.
v² ∝ 1/m Take the square root of each side
v ∝ 1/√m
This is an inverse relationship, so the molecules with the smallest molecular mass should have the highest average speeds.
A helium molecule has the smallest mass, so helium has the highest average molecular velocity.
A) Roger is incorrect. The melting wax is a physical change but there is no chemical change taking place.
B) Roger is correct. Lighting the match is a chemical change and burning the candles is a physical change.
C) Roger is correct. The melting wax is a physical change and the burning candle wick is a chemical change.
D) Roger is incorrect. Only a chemical change is taking place as evidenced by the light and heat of the burning candles.
Answers
Melting of wax is a physical change and chemical change is the burning of candle.
What is chemical and physical changes?
Chemical changes are those changes by which composition of the original matter changes and physical changes are those changes by which only appearance of the matter changes.
In the given activity:
- Melting of wax is a physical change because during this composition of wax not changes but only outer structure changes.
- Burning of candle and lighting the match are chemical change as it produces energy in the form of heat and light.
Hence, Roger is correct ie. The melting wax is a physical change and the burning candle wick is a chemical change.
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brainly.com/question/17166994
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Answers
Answer:
Siis the answer I hope this help
calcium
titanium
scandium
Answers
Answer:
Scandium
Explanation: