How are atoms arranged in molecular compounds?

1 answer:

4 0

Atoms are arranged in molecular compounds in groups.

For covalent compounds: 
consider drawing the lewis structure of the covalent compound in question, putting the atom which is least electronegative (save hydrogen) in the center.

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To prepare 250 grams of an aqueous KI solution that is 24.0% by weight of this solute how many grams of water and how many grams

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Explanation:

For concentration expressed in mass percentage of the solution we have the following formula:

concentration / 100 = mass of the dissolved / mass of the solution

mass of the dissolved KI = (concentration × mass of the solution) / 100

mass of the dissolved KI = (24 × 250) / 100 = 60 g

mass of the solution = mass of the water + mass of the dissolved KI

mass of the water = mass of the solution - mass of the dissolved KI

mass of the water = 250 - 60 = 190 g

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