3 years ago

A certain solution has [H3O+] = 8.1 X 10-8 M Calculate the pH of this solution

Chemistry

1 answer:

Aleonysh [2.5K]3 years ago

3 0

Answer:

pH = 7.092

Explanation:

pH is given by the formula;

pH = - log[H3O+]

Given [H3O+] = 8.1 X 10^-8 M

Therefore;

pH = -log 8.1 X 10^-8 M

= 7.092

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How many carbon atoms are represented in the formula for CaMg3(CO3)4

Galina-37 [17]

The formula is for 1 Calcium, 3 Magnesium, 4 Carbon, & 12 Oxygen. The 4 after the parenthesis of (CO3) distributes to each element.

Answer : There are 4 Carbon atoms in the formula.

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2 years ago

In the relationship between ΔG and K for a given reaction, if ΔG is negative, what is K? K is equal to 0. K is equal to 1. K is

frutty [35]

K is greater than 1. #platolivesmatter

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3 years ago

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Bromine has two isotopes 79Br and 81Br, whose masses (78.9183 and 80.9163 amu) and abundances (50.69% and 49.31%, respectively)

Reika [66]

Answer:

Average atomic mass = 79.9034 amu

Explanation:

The formula for the calculation of the average atomic mass is:

$Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})$

Given that:

For first isotope:

% = 50.69 %

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For second isotope:

% = 49.31 %

Mass = 80.9163 amu

Thus,

$Average\ atomic\ mass=\frac{50.69}{100}\times {78.9183}+\frac{49.31}{100}\times {80.9163}\ amu$

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3 years ago

8. __H2 + __O2-> __H2O

Rus_ich [418]

Anser:

Explanation:

hope this helps

8 0

2 years ago

The molarity (M) of an aqueous solution containing 29.8 g of sucrose, C12H22O11, in 120 mL of solution is:

Rama09 [41]

Answer:

0.726 mol·L⁻¹

Step-by-step explanation:

c = moles/litres

=====

Moles = 29.8 × 1/342.30

Moles = 0.087 06 mol

=====

Litres = 120 × 1/1000

Litres = 0.120 L

=====

c = 0.087 06/0.120

c = 0.725 mol·L⁻¹

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3 years ago