an element's name, chemical symbol, atomic number, atomic mass.
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Answer:
0.56M of acetate ions
Explanation:
Given parameters:
Mass of Ba(C₂H₃O₂)₂ = 69g
Volume of water = 970mL = 0.97dm³
Molar mass of Ba(C₂H₃O₂)₂ = 255.415g/mol
Unknown:
Concentration of acetate ion in the final solution = ?
Solution:
Let us represent the dissociation;
Ba(C₂H₃O₂)₂ = Ba²⁺ + 2C₂H₃OO⁻
We see that 1M of will produce 2M of acetate ions
Now, let us find the molarity of the barium acetate;
Molarity = 
Number of moles of Ba(C₂H₃O₂)₂ = 
Number of moles = 
= 0.27moles
Molarity of Ba(C₂H₃O₂)₂ = 
= 0.28M
since 1M of Ba(C₂H₃O₂)₂ will produce 2M of acetate ions
0.28M of Ba(C₂H₃O₂)₂ will produce 2 x 0.28 = 0.56M of acetate ions
Answer:
Hint As we know that the concept of mole is mainly to calculate the entities at the microscopic level that is ions, particles, molecules, electrons or atoms etc. It is found that mole is having the symbol mol.
Complete Step by step solution:
- As we are being provided with the information that there is 15 grams of lithium. As we know that the molar mass of lithium is 6.94 g/mol.
- As we know that mole is the amount of substance that has entities as there are atoms exactly in 12 g of carbon isotope. We should note that the number of entities in one mole is important because it is called the Avogadro constant. The numeric value of this constant is 6.022×1023.
- Firstly we will write the given mass as:
156.022×1023
- Now, we can find the number of moles by the formula of moles that is given mass of the substance divided by the molar mass of the substance.
moles=given massmolar mass⟹156.022×10236.94⟹15×6.946.022×1023⟹17.28×10−23moles
- Hence, we can conclude that there are 17.28×1023 moles in 15 grams of lithium.
Note:
- If we want to calculate the number of moles of an individual entity, like say A, that is dissolved in a solution of an entity say B (A+B), then we can do so by using the concept of mole fraction. The formula of mole fraction is given as moles of a substance divided by the total number of moles.
- We should not forget to write the unit after solving the solution. Explanation:
Answer:
A source of electricity, a wire coil, and an iron core
Explanation:
An electromagnet has three critical components:
1. A source of electricity
This is often a battery.
It generates the electric current that produces the magnetic field.
2. A wire coil
The wire carries the electric current.
Stacking the wire into loops makes a stronger magnetic field.
The more loops in the coil, the stronger the field.
3. An iron core
An iron core greatly increases the strength of the magnetic field within it and at its ends.
