3 years ago

An element's atomic number is 78. How many protons would an atom of this element have?

Chemistry

1 answer:

Oksanka [162]3 years ago

6 0

Answer:

Explanation:

atomic number is number of protons

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Maybe this example could help you to understand this problem.

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A system gains 652 kJ of heat, resulting in a change in internal energy of the system equal to +241 kJ. How much work is done?

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Answer:

-411 kj

Explanation:

We solve by using this formula

∆U = ∆Q + ∆W

This formula is the first law of thermodynamics

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Putting the value into the equation

+241 = 652 + W

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A molecule can possess polar bonds and still be nonpolar.

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What is the (OH-) in a solution with a pOH of 6.48

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Through manipulation of equations, we are able to obtain the equation:

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Then we can transform the equation into:

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Then we are able to plug in the pOH and directly get [OH-]:

$[ OH^{-}] = 10^{-6.48}$

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