3 years ago

Hydrogen and helium in the universe were formed by which of these phenomena?

Chemistry

1 answer:

baherus [9]3 years ago

5 0

I think the answer is a

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Answer:

Option A - High frequency, short wavelength.

Explanation:

If the sound is high then the frequency is also high but short-wavelength means lots of waves that always have a high pitch-sound and a high frequency.

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3 years ago

Convert 175 g of H,O into moles.

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2 years ago

5) Calculate the molality of 0.210 mol of KBr dissolved in 0.075kg pure water?

Margaret [11]

Answer:

$\boxed {\boxed {\sf 2.8 \ m }}$

Explanation:

The formula for molality is:

$m=\frac{moles \ of \ solute}{kg \ of \ solvent}$

There are 0.210 moles of KBr and 0.075 kilograms of pure water.

$moles= 0.210 \ mol \\kilograms = 0.075 \ kg$

Substitute the values into the formula.

$m= \frac{ 0.210 \ mol }{0.075 \ kg}$

Divide.

$m= 2.8 \ mol/kg= 2.8 \ m$

The molality is 2.8 moles per kilogram

5 0

3 years ago