3 years ago

What is the [H₃O⁺] (hydronium concentration) of an aqueous solution that has a pH of 3.30?

Chemistry

1 answer:

alisha [4.7K]3 years ago

4 0

Answer:

5.01 *10^(-4) M

Explanation:

pH = - log[H₃O⁺]

[H₃O⁺] = 10^(-pH)= 10^(-3.30) = 5.01 *10^(-4) M

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Which is correct if 15,390,000 is rounded to two significant figures?

BARSIC [14]

Answer:

Explanation:

Remark

This is one of those questions that you need the choices. You can't tell what you should enter. For example, in scientific notation, you would get 1.5*10^7.

Or you could keep it as an integer and round to two places 150,000,000,

I would pick scientific notation if you know how to use it. Otherwise use the interger format.

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2 years ago

From goal line to goal line, a football field is 300 ft long. If a player catches the ball while standing on one goal line, runs

KATRIN_1 [288]

Answer:

The player ran 91.44m.

Explanation:

The problem gives you the total distance between goal line to goal line in feet, and the answer must be given in meters, so you should convert the distance the player run from ft to m, because the player run the same distance from goal line to goal line to scores the touchdown.

So, you should apply the following conversion factor:

$300ft*\frac{0.3048m}{1ft}= 91.44m$