Answer:
V= 10.2L
Explanation:
NB , n= m/M= CV
Molar mass of NaOH= 40gmol-1
15.3/40= 0.0375×V
Simplify
V= 10.2L
Answer:
<u><em>Fundamental Units:</em></u>
1) Fundamental units also called base units are used to describe base quantities
2) They cannot be expressed in terms of derived units.
3)<u> Examples :</u> Meter, Ampere, Second etc.
<u><em>Derived Units:</em></u>
1) Derived units are used to describe derived quantities.
2) They can be expressed in terms of fundamental units.
3)<u> Examples: </u>Newton, Joule, Hertz, Pascal etc.
Answer:
Three Na atom(s) each lose one electron, forming three Na+ ions. One N atom gains three electrons, forming a N^-3 ion. The ions attract, forming Na3N
Explanation:
Three Na atom(s) each lose one electron, forming three Na+ ions. One N atom gains three electrons, forming a N^-3 ion. The ions attract, forming Na3N.
Ionic bond:
It is the bond which is formed by the transfer of electron from one atom to the atom of another element.
Both bonded atoms have very large electronegativity difference. The atom with large electronegativity value accept the electron from other with smaller value of electronegativity.
For example:
Na₃N is ionic compound. The electronegativity of is 3.04 and for sodium is 0.93. There is large difference is present. That's why electron from sodium is transfer to the nitrogen. Sodium becomes positive and nitrogen becomes negative ion.
One nitrogen atom required three electrons to complete the octet while sodium have one valance electron that's why three sodium atoms combine with one nitrogen atom.
Answer:
The correct answer is <em>B. 734 g</em>
Explanation:
The chemical formulae of lithium sulfate is Li₂SO₄. With this, we can calculate the molecular weight (MM) of lithium sulfate as follows:
MM(Li₂SO₄) = (2 x molar mass Li) + molar mass S + (4 x molar mass O)
= (2 x 6.9 g/mol) + 32 g/mol + (4 x 16 g/mol)
= 109.9 g/mol
We need to prepare a solution with a molarity of 2.67 M. That means that the solution has to have 2.67 moles of Li₂SO₄ per liter of solution. We can convert from mol to grams with the calculated molecular weight and then we have to multiply by the volume of solution (2500 ml= 2.5 L), as follows:
Mass = 2.67 mol/L x 109.9 g/mol x 2.5 L ≅ 734 g
Answer: The correct answer is- Replication of DNA ( deoxyribonucleic acid) must happen before a body cell can begin mitotic cell division.
Mitotic division is a type of cell division in which a parent cell divides two identical daughter cells ( through a series of five stages that is- prophase, metaphase, anaphase, telophase, and cytokinesis) having same number of chromosomes as that of the parental cell.
It occupies the second stage of cell cycle, the first being interphase ( which has three stages that is G1, S, and G2 phase). Replication of DNA takes place in the interphase ( particulary in the S phase) so that cell is ready to divide in the mitotic phase.
Thus, replication of DNA ( deoxyribonucleic acid) must happen before a body cell can begin mitotic cell division.
