What is the molarity of a solution prepared by dissolving 8 grams of BaCl2 in enough water to make a 450. 0 mL solution? (Hint:
1 answer:
Molarity is the molar concentration of the solute dissolved in a volume of a solution. The molarity of the solution prepared by dissolving barium chloride will be 0.085 M.
<h3>What is molarity?</h3>Molarity is the ratio of the moles of the solute to that of the volume of the solution in Liters. It can be given as,
Here, moles of the barium chloride can be given by the mass and the molar mass and volume is given as 0.450 L.
Substituting values in the equation:
Therefore, 0.085 M barium chloride is the molar concentration.
Learn more about molarity here:
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Answer:
Phosphorus-28 undergoes beta-minus decay to produce
- an electron,
- a Silicon-28 nuclei, and
- an electron antineutrino.
Explanation:
In simple words, when a nucleus undergoes beta-minus decay, a neutron is converted to a proton. An electron and an electron antineutrino will be released.
.
One way to tell whether a neutron is converted to a proton, but not vice versa, is to check the sum charges on the two sides of this equation.
- Left-hand side: 0. Neutron is neutral.
- Right-hand side: 1 + (-1) = 0. Each proton carries a charge of +1. Each electron (beta-minus particle) carries a charge of -1. Antineutrinos are neutral.
The charges on the two sides of this equation is the same. Hence this nuclear equation is possible (but not necessarily correct; however, if the proton and the neutron are in the wrong place the charge won't even be the same.)
Since the mass number of a proton and a neutron are both 1, the overall mass number of the atom will stay the same.
The atomic number is the number of protons in each atom. That number determines the symbol and the chemical properties of the atom. When one neutron in an atom is converted to a proton, the atomic number of the atom will increase by 1.
The atomic number of the daughter nucleus, silicon, is 14. It takes a parent nucleus with atomic number to produce a silicon atom. Refer to a modern periodic table. Atomic number
corresponds to the element aluminum.
Also, the mass number of the daughter nucleus is 28. Since the mass number would stay the same in a beta decay, the mass number of the parent nucleus would also be 28. In other words, it takes an aluminum-28 atom to undergo beta-decay to produce a silicon-28 atom.
Complete the other details (electron and electron antineutrino) to obtain the equation
.