3 years ago

Why is the atomic mass of most elements not a whole number?

1 answer:

Crank3 years ago

3 0

The atomic mass is the average of the isotopes of the element meaning most averages of isotopes will not be whole numbers

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What is the temperature of gas and volume of gas

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Explanation:

500 degree Celsius because we can see it in the tube

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3 years ago

Will mark Brainliest, thanks, and 5 stars!

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What is the pH of a 5.09 x 10-5 M solution of NaOH?

Varvara68 [4.7K]

Answer: The pH of the solution is 9.71

Explanation:

1 mole of NaOH produces 1 mole of sodium ions and 1 mole of hydroxide ions.

We are given:

pOH of the solution = 7.2

To calculate the pH of the solution, we need to determine pOH of the solution. To calculate pOh of the solution, we use the equation:

$pOH=-\log[OH^-]$

We are given:

$[OH^-]=5.09\times 10^{-5}M$

Putting values in above equation, we get:

$pOH=-\log(5.09\times 10^{-5})\\\\pOH=4.29$

To calculate pH of the solution, we use the equation:

$pH+pOH=14\\pH=14-4.29=9.71$

Hence, the pH of the solution is 9.71

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3 years ago

How many valence electrons does B (boron) have? A. 13 B. 5 C. 10 D. 3

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Answer:

Boron has 3 valence electrons

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