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andrew-mc [135]

3 years ago

12

You are at a carnival fun house standing 3m in front of a lens with a focal length of 2.5m. What would happen to your image if t

he lens was concave? What would the image look like if the lens was convex?

1 answer:

Jlenok [28]3 years ago

4 0

The convex lens would produce a virtual

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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.

Hence, the number of moles of strontium bicarbonate is $7.5\times 10^{-9}mol$

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