1. elements of the same periodon the periodic table will have the a. Same number

Question

1. elements of the same periodon the periodic table will have the

    a. Same number of electrons

    bSame number of protons.

    C increasing number of protons as they move across the period.

    D. Decrease number of protons as they move across the period.

2. Given the following reaction: N2H4-> 2H2 + N2, How many moles of H2 will be produced if 3 moles or N2H4 reacts?

3. What is the hydroxide-ion concentration of a solution if its hydronium-ion concentration is 1x 10^5 mole per liter?

4. The pH of the solution in question 3 is    .........?

Explanation / Answer

bSame number of protons.

pH = - log [1x10^-5] = 5

In an aqueous solution, the concentration of the hydroxide ion multiplied by the concentration of the hydronium ion is equal to 1x10^-14.

In equation form;

[OH-]*[H3O+] = 1x10^-14

Rearrange to solve for [OH-] to get

[OH-] = 1x10^-14 / [H3O+]
[OH-] = 1x10^-14 / [1x10^-5]

[OH-] = 1x10^-9 mol / L

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