Answers
Given:
n = 0.20 mol
Required:
N
Solution:
N = n × 6.02 × 10²³ atoms/mol
N = 0.2 mol × 6.02 × 10²³ atoms/mol
N = 1.20 × 10²³ atoms
Therefore, there are 1.20 × 10²³ gold atoms in 0.2 mol of a gold sample.
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1.01 x 10^-3 moles
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All light travels at the same speed.O TrueO False
What action is NOT necessary before lighting a Bunsen burner?A)Make sure there are no holes in the hose connected to the burner.B)Leave the gas stop open for a few minutes before lighting to clear the line.C)Clear the burner area of flammable materials such as solvents and papers.D)Check that the gas regulator and air inlet on the burner can be adjusted.
The resolution calculated for the tlc separation of a two-component mixture is determined to be equal to 2.0. does the represent good separation or not? explain
How can you remove sand from salt? Which physical property of sand was used in the process?
Answers
The nuclear reactions involves the nuclei of the atoms, large amount of energy will be involved and some of the mass is converted into energy.
Explanation
Nuclear reactions are reactions which leads to change in the nuclei of the atoms.
The nuclear reaction occur between the nuclei of two atoms or between nuclei and other particles of two atoms.
The product formed will be different from the reactants.
The difference in the mass of the products and reactants are generally converted into energy.
In some nuclear reactions like nuclear fusion reaction, large amount of energy is required to collide the nuclei of two heavy elements to undergo nuclear chain reaction.
Answers
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.
Answers
Answer:
6.56x10⁻³ mol
Explanation:
First we calculate how many HCl moles are there in 50.0 mL of a 0.1800 M solution:
- 0.1800 M * 50.0 mL = 9.00 mmol HCl
Then we need to calculate how many HCl moles were in excess, that number is the same as the number of NaOH moles they reacted with:
- 0.0980 M * 24.90 mL = 2.44 mmol NaOH = 2.44 mmol HCl
Finally we calculate the difference between the original number of HCl moles and the number remaining after the reaction with XnCO₃:
- 9.00 mmol - 2.44 mmol = 6.56 mmol
- 6.56 mmol / 1000 = 6.56x10⁻³ mol
Final answer:
The amount of HCl that reacted with the carbonate is found by subtracting the amount of HCl neutralized by NaOH from the total initial amount of HCl, resulting in 0.00656 moles of HCl reacting with carbonate.
Explanation:
In this problem, we first need to calculate the total amount of HCl initially used. This is done using the formulaMolarity (M) = moles of solute/Liters of solution. We can calculate moles of HCl as (0.1800 moles/L) * (0.0500 L) = 0.00900 moles.
Next, the HCl reacts with the carbonate, but there is excess that needed to be neutralized using NaOH. The amount of HCl neutralized by NaOH can be calculated similarly as (0.0980 moles/L) * (0.0249 L) = 0.00244 moles.
Thus, the amount of HCl that reacted with the carbonate is the initial moles of HCl minus the moles of HCl neutralized by NaOH. This yields 0.00900 moles - 0.00244 moles = 0.00656 moles of HCl reacted with the carbonate.
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Answers
The concave lens is a lens which has an inward curve in the middle, that is, the edges of the curve are thicker than the center of the lens, because of this, any light that enter the lens will spread out [diverge]. An image will look smaller and upright when viewed by a concave lens. Image formed by concave lens are usually VIRTUAL.
A concave lens will produce a real image ONLY if the object is located beyond the focal point of the lens.
A convex lens is a converging lens, this is because, the center of the lens is thicker than its edges. Any ray of light that passes through the lens will converge at the middle of the lens at point called principal focus. A convex lens produce a VIRTUAL image when the object is placed infront of the focal point. The virtual image formed is always magnified and upright.
The image formed by any lens like concave and convex may be real or virtual.
How many types of lens are present?
Mainly two types of lens are present and that are concave lens also known as divergent lens and convex lens, also known as convergent lens.
- Any light passing through the lens will disperse [diverge]. When viewed through a concave lens, an image seems smaller and more upright. Concave lenses frequently produce VIRTUAL images and concave lens will produce a real image only if the object is located beyond the focal point of the lens.
- Any beam of light passing through the lens will converge in the lens's center, known as the main focus. When an object is placed in front of the focal point, a convex lens produces a VIRTUAL image. The resulting virtual picture is constantly amplified and oriented vertically.
Hence image formed by a lens may be real or virtual.
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Answers
Answer and Explanation:
(a) Na and H : The compound formed by Na and H is sodium hydride which formula is NaH
(b) B and O : The compound formed by Ba and O is barium oxide which formula is BaO
(C)Na and S : The compound formed by Na and S is sodium sulfide which formula is
(D) Al and F : The compound formed by Al and F is aluminium fluoride which formula is
(E) F and O : The compound formed by F and O is oxygen fluoride which formula is
(F) Sr and Cl : The compound formed by Sr and Cl is strontium chloride which formula is
Answers
Answer:
a molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms
Answer:
: A molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms.
Explanation:
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