Answer:
4.99 × 10³ g/mol
Explanation:
Step 1: Given and required data
Mass of the covalent compound (m): 62.4 gVolume of the solution (V): 1.000 LOsmotic pressure (π): 0.305 atmTemperature (T): 25°C = 298 KStep 2: Calculate the molarity (M) of the solution
The osmotic pressure is a colligative pressure. For a covalent compound, it can be calculated using the following expression.
π = M × R × T
M = π / R × T
M = 0.305 atm / (0.0821 atm.L/mol.K) × 298 K
M = 0.0125 M
Step 3: Calculate the moles of solute (n)
We will use the definition of molarity.
M = n / V
n = M × V
n = 0.0125 mol/L × 1.000 L = 0.0125 mol
Step 4: Calculate the molar mass of the compound
0.0125 moles of the compound weigh 62.4 g. The molar mass is:
62.4 g/0.0125 mol = 4.99 × 10³ g/mol
How many moles of hydrochloric acid will react with one mole of aluminum hydroxide to produce a neutral solution
Answer: 3 moles of HCl
Explanation: let’s do a balanced chemical equation
Al(OH)3 + 3HCl —> AlCl3 + 3H2O
We see that for every 1 mole of Al(OH)3 we need 3 moles of HCl
What would the isotope symbol (in hyphen notation) look like for an atom that has a mass number of 204 and an atomic number of 82?
O a
Lead-82
ob
Thallium-204
Ос
Lead-204
Thallium-82
Od
HELP ASAP
Answer:
[tex]\boxed {\boxed {\sf C. \ Lead-204}}[/tex]
Explanation:
One way of writing an isotope is hyphen notation or:
element name - mass numberWe know the mass number (protons and neutrons) is 204. We can automatically eliminate choices A and C, because they claim the mass number is 82.
Now we must find the element name. We know the atomic number or number of protons is 82. Look on the periodic table for the element with atomic number 82, which is lead.
Therefore,
element name = Lead mass number = 204The isotope notation in hyphen notation is: Lead-204
3. Which element is more reactive?
a. Calcium (Ca)
b. Titanium (Ti)
C. Silver (Ag)
d. Rubidium (Rb)
Answer:
titanium
Explanation:
according to my knowledge titanium is more expensive than diamonds....A country becomes powerfull by having more quantity of titanium....all the bombs, nuclear weapons and nuclear enegry are made from titanium so it is expensive and powerfull too..
Would the molecule "Mg20" occur in real life?
Explain.
Answer:
No, it will not exist in real life
Explanation:
Let us consider the electronic configuration of magnesium; Ne 3s2
We must also assume that the compound Mg20 is ionic. If this is the case, then it involve Mg+ and O^2-.
The electronic configuration of Mg+ is Ne 3s1. We can see that this specie has not yet attained a stable noble gas configuration, As a result of this, the ion is not stable. Hence, Mg20 does not occur in real life,
Bohr's model was correct in assigning energy levels to electrons.
Answer:
yes that is true........
A 9.70-g piece of solid CO 2 is allowed to sublime in a balloon. The final volume of the balloon is 1.00 L at 298 K. What is the pressure of the gas inside the balloon?
a. 5.39 atmb. 2.37 102 atmc. 2.52 atmd. 0.186 atme. none of these
Answer:
a. 5.39 atm
Explanation:
Pressure = ?
Volume = 1 L
Temperature = 298 K
Mass = 9.70g
The formular relating these variables is the ideal gas equation;
PV = nRT
where R = gas constant = 0.082057 L.atm.K-1.mol-1
n can be obtained from the formular below;
n = mass / molar mass = 9.70 / 44
n = 0.2205 mol
P = nRT / V
P = 0.2205 * 0.082057 * 298 / 1
P = 5.392 atm
The correct option is option A.
Which describes a value for density?
Answer:
The density of a substance is the relationship between the mass of the substance and how much space it takes up (volume). The mass of atoms, their size, and how they are arranged determine the density of a substance. Density equals the mass of the substance divided by its volume
What differences were observed between the mixture of salt and sand in 250-mL beaker and the same materials after water was added?
[tex]{ \qquad\qquad\huge\underline{{\sf Answer}}} [/tex]
Here's what we observed in the following two scenarios :
When the mixture of salt and sand is placed in a beaker, they form a heterogeneous mixture, and it is a bit troublesome to separate those two
But when water is added to the mixture, salt gets dissolved in it, whereas sand doesn't and it settles down with time, amd here we can easily separate sand and salt mixture, we just need to take out the water when sand has settled and just heat it to get salt back.
How many atoms of O are there in 1.00 moles of CO2?
Answer:
1.204 x 10²⁴ atoms of oxygen in 1 mole of CO₂
Explanation:
1 mole of CO₂ contains 6.02 x 10²³ molecules of CO₂
1 molecule of CO₂ contains 2 atoms of oxygen
Therefore, Atoms of oxygen in 1 mole of CO2 => 6.02 x 10²³ molecules CO₂ x
2 atoms oxygen / molecule CO₂ = 2 X 6.02 X10²³ atoms of oxygen = 1.204x10²⁴ atoms of oxygen in 1 mole CO₂
Using the van der waals equation, the pressure in a 22.4 L vessel containing 1.50 mol of chlorine gas at 0.00 c is____________atm. (a= 6.49L^2-atm/mol^2, b=0.0562 L/mol)
A. 1.50
b. 0.676
c. 0.993
d. 1.48
e. 1.91
Answer:
D. 1.48atm
Explanation:
Van der waals equation is given as:
(P +an²/v²) (v - nb) = nRT
Where;
P = pressure (atm)
V = volume (L)
R = gas constant (0.0821 Latm/molK)
a and b = gas constant specific to each gas
T = temperature (K)
n = number of moles
According to the given information; V = 22.4L, T = 0.00°C (273.15K), R = 0.0821 Latm/molK, a = 6.49L^2-atm/mol^2, b = 0.0562 L/mol, n = 1.5mol
Hence;
(P + 6.49 × 1.5²/22.4²) (22.4 - 1.5×0.0562) = 1.5 × 0.0821 × 273.15
(P + 6.49 × 2.25/501.76) (22.4 - 0.0843) = 33.638
(P + 0.0291) (22.316) = 33.638
22.316P + 0.649 = 33.638
22.316P = 33.638 - 0.649
22.316P = 32.989
P = 32.989/22.316
P = 1.478
P = 1.48atm
PLEASE HELP!!! I'll give brainliest answer
Answer:
1. MG
2. N
3. F
4. NA
5. O
6. K
Answer:
Largest to Smallest: Na, K, Mg, N, O, F
Explanation:
90Sr →?+e
38
Express your answer as a nuclear equation
Strontium ( Atomic Number 38 ) undergoes beta minus decay. Atomic mass of Strontium is 90 u. The given reaction shows the complete nuclear reaction of Strontium.
⁹⁰₃₈ Sr → ⁹⁰₃₇ Y + ⁰₋₁ β + ⁻∨ₑ
Beta particle β is a high speed electron. Whenever Strontium undergoes beta minus decay, the neutron located inside its nucleus gets converted into proton. During the same reaction, a beta particle and electron antineutrino are also being released or emitted.
In the nuclear reaction ( Beta minus decay ) of Strontium, mass and charge are conserved.
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Which part of the cell is a gel-like material that contains chemicals used to break down large molecules so that they can be used by other organelles?
Cytoplasm
Mitochondrion
Nucleus
Ribosome
A. Cytoplasm is the correct answer!
Would you expect the properties of rubidium (Rb) to be more similar to
potassium (K) or strontium (Sr)? Explain. *
If Gold and Copper cost the same, which would you rather have? Explain your answer with evidence and reasoning.
Answer:
Copper and silver are the best conductors, but gold connections outlast both of them because they do not tarnish. It is not that the gold lasts longer, but that it remains conductive for a longer time. Gold is ductile: It can be drawn out into the thinnest wire.
Explanation:
How do you separate alcoh0l from water?
Answer:
Fractional distillation
Explanation:
Medical researchers are developing new anticancer drugs that treat a cell culture with a certain compound. Following treatment, the researchers noticed that the culture had stopped growing. Untreated cells from
the same culture, however, continued to grow. These results could indicate that the compound blocks the normal cell cycle. What else could have caused these results?
One reason could be that the compound prevented cells from mutating. The correct option is D.
What is anticancer drug?Any drug that is effective in the treatment of malignant, or cancerous, disease is referred to as an anticancer drug.
Anticancer drugs are classified into several categories, including alkylating agents, antimetabolites, natural products, and hormones.
Chemotherapy, also known as chemotherapy or anticancer medication, is a type of medication used to destroy, kill, shrink, or slow the growth of cancer cells.
As after the treatment, the researchers noticed that the culture had stopped growing, it can be possible that it prevented new mutation.
Thus, the correct option is D.
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Your question seems incomplete, the missing options are:
A. The compound has degraded
B. The compound had no effect
C. The compound killed the treated cell
D. The compound prevented cells from mutating
The following chemical reaction, KOH + HCl --> KCl + H2O is a ______________ reaction and the salt is _____________. a double replacement; potassium chloride b acid-base; potassium chloride c single replacement; potassium chloride d choice 1 and choice 2
The answer to the above question is B.
The following chemical reaction KOH + HCl → KCl + H2O is a type of single replacement reaction and the salt is Pottasium chloride.
What is a single replacement reaction?A single replacement reaction is a type of reaction that involves the substitution of one element in a compound with another.
The following reaction is given in this question;
KOH + HCl → KCl + H2O
Pottasium displaces hydrogen in this equation to form pottasium chloride salt. Therefore, it is a type of single replacement reaction.
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Based on the law of conservation of matter, describe the relationship between the mass of the recants, and the mass of the products
Answer:
Mass of reactant and mass of product must be equal.
Explanation:
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
Explanation:
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
In given photosynthesis reaction:
6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂
there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.
A family pool holds 10,000 gallons of water.
How many liters is this?
Answer:
45460.9
Explanation:
Answer:
37854.12
Explanation:
for every 1 US gallon there is 3.78541 liters. So if there is 10,000 gallons, you would multiply 3.78541 by 10,000.
What type of chemical reaction is the following? 2 Fe + O2
Single replacement
Double replacement
Decomposition
Synthesis
O Combustion
Answer:
Synthesis
Explanation:
is The reaction time is different for different stimuli
true or false?
Answer: true
Explanation: In this example, the processes (perceive, process, and respond), are done in a matter of milliseconds, but reaction time can vary depending on a variety of factors: Complexity of the stimulus-The more complex the stimulus, the more information that has to be processed, the longer this process will take.
BROOO PLEASE HELP ME
Answer:
Flask d
Explanation:
I promise u it’s flask d
Which gas law is represented by the following equation: V1/T1 = V2/T2
Gay-Lussac's law
Boyle's law
Avogadro's law
none of these
Charles's law
Answer:
Charles's law
Explanation:
The expression:
V1/T1 = V2/T2
represents Charles's law
The law states that "the volume of a fixed mass of a gas varies directly as its absolute temperature if the pressure is constant".
So,
V1/T1 = V2/T2
Pressure and the number of moles are constant
V and T are the volume and temperature
1 and 2 are the initial and final states.
Answer:
charle's law
Explanation:
Can someone tell me how to find the coefficients?
Answer:
2C2H6 + 7O2 → 4CO2 + 6H2O
Explanation:
First off you find them by balancing the equation ( equal amounts of elements on both sides) So add a two infront of the C2H6. Now you have 4 Carbons and 12 Hydrogens on the left aswell as 2 oxygens.
Now go to the right side and put a 4 infront of CO2 and a 6 infront of H2O. You now have 4 carbons 12 hydrogens and 14 oxygens on the right side.
Finally go back to the let side and place a 7 infront to make the left have 14 oxygens just like in the right. A trick to use is to save the coefficients with only one element till the end so you can do less work in the long run.
But i hope this helped its balanced and down to the smallest whole numbers possible most teachers want whole numbers as the coefficient.
These are tricky at first but once you practice a bit you will be a pro.
Complete table below, using the diagram of an atom shown at right.
8 A
-0
name
symbol
=
I
Properties of subatomic particles
charge
(in multiples of e)
approximate
mass
(amu)
+1
1.0
location
on diagram
A
-1
0.0005
B
D
(choose one) v
(choose one)
V
Answer:
A
Explanation:
because they have 1 process
Liquid hexane CH3CH24CH3 will react with gaseous oxygen O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O
Suppose 0.862 g of hexane is mixed with 5.1 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Be sure your answer has the correct number of significant digits.
Answer:
2.64g of CO₂ are produced
Explanation:
The reaction of hexane with O₂ is:
C₆H₁₄ + 19/2O₂ → 6CO₂ + 7H₂O
To solve this question, we must convert each mass of reactant to moles in order to find limiting reactant and, with the chemical reaction we can find the moles of carbon dioxide produced and the maximum mass produced:
Moles hexane -Molar mass: 86.18g/mol-:
0.862g * (1mol / 86.18g) = 0.01 moles
Moles Oxygen -Molar mass: 32g/mol-:
5.1g * (1mol / 32g) = 0.16 moles
For a complete reaction of 0.01 moles of hexane there are required:
0.01moles hexane * (19/2 Oxygen / 1mol Hexane) = 0.095 moles oxygen
As there are 0.16moles, limiting reactant is hexane.
0.01 moles of hexane produce:
0.01 moles * (6 moles carbon dioxide / 1 mole hexane) = 0.06 moles of CO₂.
The mass is -Molar mass CO₂: 44g/mol-:
0.06 moles of CO₂ * (44g/mol) =
2.64g of CO₂ are producedCalculate the pH of a titration at the point when 15.0 mL of 0.15 M NaOH is added to 30.0 mL 0f 0.20 M HNO.
Answer:
The correct answer is 1.10.
Explanation:
Based on the given information, the molarity of the NaOH is 0.15 M, that is, 0.15 moles per liter of the solution.
Now the moles present in the 15 ml of the solution will be,
0.015 × 0.15 = 2.25 × 10⁻³ moles of NaOH or 0.0025 moles of NaOH
Now, molarity of the HNO₃ given is 0.20 M, which means 0.2 moles per liter of the solution.
Now the moles present in the 30 ml of the solution will be,
0.030 × 0.2 = 0.006 moles of HNO₃
Now the complete disintegration of acid and base will be,
NaOH (aq) (0.025 moles) ⇔ Na⁺ (aq) (0.025) + OH⁻ (aq) (0.025 moles)
HNO₃ (aq) (0.006 moles) ⇔ H⁺ (0.006 moles) + NO₃⁻ (aq) (0.006 moles)
Now the additional Hydrogen ions at titration point is,
= 0.006 - 0.0025 = 0.0035 moles of H+
Now the concentration of H+ ions in the 45 ml of the solution will be,
= 0.0035/45 × 1000
= 0.078 M
pH = -log[H⁺] = -log [0.078]
= 1.10
The symbol for a radioactive nuclide is Superscript 234 subscript 90 upper T h.. Which statement is correct?
The atomic number of the radioactive nuclide is 90.
The mass number of the radioactive nuclide is 144.
The number of neutrons that are present in the nucleus of each atom is 324.
The number of protons that are present in the nucleus of each atom is 234.
The correct statement : The atomic number of the radioactive nuclide is 90.
Further explanationIn the following element notation,
[tex]\large {{{A} \atop {Z}} \right X}[/tex]
X = symbol of elemental atom
A = mass number
= number of protons + number of neutrons
Z = atomic number
= number of protons = number of electrons, on neutral elements
The symbol for a radioactive nuclide :
[tex]\tt ^{234}_{90}Th[/tex]
atomic number = 90
mass number = 234
number of neutrons = 234-90=144
number of protons = atomic number = 90
Answer:
A on EDG
Explanation:
A 100 cm³ measuring cylinder has an uncertainty of ± 1.00 cm³. A student used the measuring cylinder to measure 25.00 cm³ of a
solution into a burette. The burette has an uncertainty of 0.05 cm³. Assuming no other errors what range of readingscould the burette
give for the accurate transfer of the 25.00 cm³ of solution.
Every burette reading must have two decimal places, with the second number being either 0 or 5. A percentage error of 0.2% is produced for each reading by a one-drop mistake in a volume of 25.00 cm3. You could attempt to put the measurements and methods together.
In terms of percentage, relative uncertainty equals x x 100. If we know the relative uncertainty, we may use the formula absolute uncertainty = relative uncertainty 100 measured value to determine the absolute uncertainty. As a result, the uncertainty of the mass measurement and the uncertainty of the density determination affect the uncertainty of the volume, which means that the factors determining the uncertainty accumulate as each physical quantity is measured.
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