How many cups do you need for 4 moles rock salt (NaCl)? Rock salt weighs 520g per 1 cup

How many cups do you need for 1 kg of ice? Ice cubes weigh 220g per 1 cup

Question

contestada

Respuesta :

Alleei Alleei · Answer 1 · 2020-03-19T06:32:23+01:00

Answer :

(1) The number of cups needed are, 0.45 cups.

(2) The number of cups needed are, 5 cups.

Explanation :

Part 1:

First we have to calculate the moles of NaCl.

[tex]\text{Moles of NaCl}=\frac{\text{Mass of NaCl}}{\text{Molar mass of NaCl}}[/tex]

[tex]\text{Moles of NaCl}=\frac{520g}{58.5g/mol}=8.89mol[/tex]

Now we have to calculate the number of cups needed.

As, the number of cups needed for 8.89 mole of NaCl = 1 cups

So, the number of cups needed for 4 mole of NaCl = [tex]\frac{4}{8.89}=0.45[/tex] cups

Thus, the number of cups needed are, 0.45 cups.

Part 2:

Given:

Mass of ice cubes = 1 kg = 1000 g

Now we have to calculate the number of cups needed.

As, the number of cups needed for 220 g of ice = 1 cups

So, the number of cups needed for 1000 g of ice = [tex]\frac{1000}{220}=4.5\approx 5[/tex] cups

Thus, the number of cups needed are, 5 cups.