1. A sample of nitrogen occupies a volume of 250 mLat 298 K. What volume will it occupy at 268 K?
Answers
Answer:
0.225 L = 225 mL
Explanation:
Charles' Law states that for a fixed pressure, the volume is directly proportional to the temperature, which means things expand at the same rate as the rate of it being heated up
Mathematically, we can write that as:
V1/T1 = V2/T2, where 1 and 2 are the two situations
So, when we substitute the values in, we get:
0.25 L/298 K = V2/268 K
Rearranging this, we get:
(0.25/298) x 268 = 0.225 L = 225 mL.
This also makes sense, as the volume reduced a little when the temperature reduced (cooled down)
Let me know if this makes sense, and hope I helped! :)
Related Questions
Equal amounts of ethanol and water are mixed at room temperature and at 101.3 kPa. Which process is used to separate the ethanol from the mixture?
What is the molar mass of a substance
Why does changing the volume of a container change the pressure of the gas in it?
Write the atomic symbols for isotopes with the following characteristics? 1)an oxygen atom with 10 neutrons 2)a neon atom with twelve neutrons 3)25 electrons and 28 neutrons 4)a mass number of 24 and 13 neutrons 5)a titanium atom with 25 neutrons
Answers
Explanation:
Below is an attachment containing the solution
Answer:
pH= 0.369
Explanation:
The formic acid reacts with NaOH as
HCOOH + NaOH= HCOONa + H2O
Apply CaVa/ CbVb = Na/Nb
Ca×25/(29.8×0.3587) = 1/1
Ca= (29.8×0.3587)/25= 0.428M
pH = - log(H+)
Since only 0ne H+ is in the stoichiometric equation, it means H+ = 0.428M
pH = -log(0.428) =0.369
Answers
True, Plants don't have brains, but they still adapt to their environments.
What is adaptation?
Adaptation is a process where they are changing their nature to suit the environment.
We have seen that plants do adaptation according to the environment, as in the summer season their leaves are hanging down but in the rainy season they show blossoms and green leaves. So, according to the environment for the survival and reproduction they adapt their body.
Hence, plants have no brains, but they still adapt.
To learn more about adaptation, visit the below link:
Answer:
True
Explanation:
I just took that last year, and got a100%
B. pressure
C. temperature
D. dissolved salt
Answers
Answer:
The answer is D. dissolved salt hopefully this helps!
Final answer:
Salinity refers to the amount of dissolved salt in a body of water. It affects the types of organisms that can live in that water due to the effects of salinity on cellular hydration. Certain organisms are adapted to survive differing levels of salinity.
Explanation:
Salinity refers to the amount of dissolved salt in a body of water. It is usually expressed as the number of grams of salt per kilogram of water. The salinity of a body of water can have significant impacts on its ecosystem, including the types of organisms that can survive there.
For instance, high salinity levels can cause cells to dehydrate, making it difficult for some organisms to survive. On the other hand, certain organisms like halophiles thrive in high salinity conditions. Therefore, understanding salinity is crucial in studying marine and aquatic biology.
Learn more about Salinity here:
#SPJ6
Answers
(mass of strontium) / (mass of compound) * 100% = (percent mass of Strontium)
1. The mass of strontium is 87.62 and the mass of Chlorine is 35.45. There are 2 chlorine atoms in the compound, so 35.45*2 = 70.9. Add the strontium to get the mass of compound. 70.9 + 87.62 = 158.52. Now, we can use the equation.
87.62 / 158.52 * 100% = 55.27% Strontium
2. There are 2 Iodine atoms in the compound, and the molar mass of Iodine is 126.9. The mass of the compound is 126.9 + 87.62 = 214.52. Now, we can use the equation
87.62 / 214.52 * 100% = 40.84% Strontium
3. The molar mass of Oxygen is 16, and there is only one oxygen atom. So the mass of the compound will be 16 + 87.62 = 103.62. Now we can use the equation.
87.62 / 103.62 * 100% = 85.46% Strontium
4. Finally, the molar mass of sulfur is 32.06, and there is only one sulfur atom in the compound, so the mass will be 32.06 + 87.62 = 119.68. Now we can use the equation
87.62 / 119.68 * 100% = 73.21% Strontium
Therefore, the answer is 3 because it has the highest percentage of Strontium than the other compounds. Hope this helped!! :D
Answers
Considering the definition of molar mass and molarity, the volume of each compound is:
- NaCl= 0.1355 L
- C₂H₆O = 0.0622 L
- CH₃COOH = 0.047 L
Definition of molar mass
The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Definition of molarity
Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
Molarity is expressed in units.
Volume required
You know that the molar mass of each compound is:
- NaCl = 58.44 g/mol
- C₂H₆O = 46.06 g/mol
- CH₃COOH = 60.0 g/mol
On the other side, you know that the mass of each compound is:
- NaCl = 2.14 g
- C₂H₆O = 4.30 g
- CH₃COOH = 0.85 g
Then, considering the definition of molar mass, the amount of moles of each compound is:
- NaCl =
= 0.0366 moles
- C₂H₆O =
= 0.0933 moles
- CH₃COOH =
= 0.0141 moles
The molarity of each compound is:
- NaCl = 0.27 M
- C₂H₆O = 1.50 M
- CH₃COOH = 0.30 M
Considering the molarity, the volume of each compound is calculated as:
- NaCl =
= 0.1355 L
- C₂H₆O =
= 0.0622 L
- CH₃COOH =
= 0.047 L
Learn more about
molar mass:
molarity:
number of moles : 2.14 / 58.44 = 0.0366 moles
V = n / M => 0.0366 / 0.270 = 0.1355 L
__________________________________________
b) C2H6O = 46.06 g/mol
number of moles : 4.30 / 46.06 = 0.0933 moles
V = n / M => 0.0933 / 1.50 = 0.0622 L
___________________________________________
c) CH3COOH = 60.0 g/mol
number of moles : 0.85 / 60.0= 0.0141 moles
V = n / M => 0.0141 / 0.30 = 0.047 L
___________________________________________
hope this helps!
Answers
So there is calcium, symbol is Ca and an atomic number of 20.
Carbon: symbol is C and an atomic number of 6.
Oxygen: symbol is O and an atomic number of 8.
In one molecule of CaCO3, there is one atom of Ca, one atom of C, and three atoms of O as shown by the subscript next to O in the formula. There are no other subscripts to indicate more than one atom of the other elements, so there is only one atom of the other two elements