2 years ago

How did Ptolemy's model of the solar system explain the apparent changes in speed and direction of the planets?

Chemistry

1 answer:

strojnjashka [21]2 years ago

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Answer:C. Then plants spun on epicycles

Explanation:don't have one I just checked through it on my screen.

Hope it helps

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How many total moles of ions are released when the following sample dissolves completely in water? Enter your answer in scientif

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<u>Answer:</u> The number of moles of strontium bicarbonate is $7.5\times 10^{-9}mol$

<u>Explanation:</u>

Formula units are defined as lowest whole number ratio of ions in an ionic compound. It is calculate by multiplying the number of moles by Avogadro's number which is $6.022\times 10^{23}$

We are given:

Number of formula units of $Sr(HCO_3)_2=4.55\times 10^{15}$

As, $6.022\times 10^{23}$ number of formula units are contained in 1 mole of a substance.

So, $4.55\times 10^{15}$ number of formula units will be contained in = $\frac{1}{6.022\times 10^{23}}\times 4.55\times 10^{15}=7.5\times 10^{-9}mol$ of strontium bicarbonate.

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