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otez555 [7]
3 years ago
9

How many moles are in 4.3 x 1024 molecules of H20?

Chemistry
1 answer:
Bond [772]3 years ago
4 0

Answer:

\boxed {\boxed {\sf About 7.1 \ mol \ H_2O}}

Explanation:

To convert from molecules to moles, we must use Avogadro's Number: 6.022*10²³. This tells us the amount of particles (atoms, molecules, etc.) in 1 mole of a substance. In this case, the particles are molecules of water.

\frac {6.022*10^{23} \ molecules \ H_2O} {1 \ mol \ H_2O}

Multiply by the given number of molecules.

4.3 *10^{24} \ molecules \ H_2O *\frac {6.022*10^{23} \ molecules \ H_2O} {1 \ mol \ H_2O}

Flip the fraction so the molecules of water cancel.

4.3 *10^{24} \ molecules \ H_2O *\frac {1 \ mol \ H_2O} {6.022*10^{23} \ molecules \ H_2O}

4.3 *10^{24}  *\frac {1 \ mol \ H_2O} {6.022*10^{23} }

\frac {4.3 *10^{24}\ mol \ H_2O} {6.022*10^{23} }

7.140484889 \ mol \ H_2O

The original measurement of atoms has 2 significant figures ( 4 and 3), so our answer must have the same. For the moles we calculated, that is the tenth place. The 4 in the hundredth place tells us to leave the 1.

7.1 \ mol \ H_2O

There are about 7.1 moles of water.

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