Answer:
Well, to separate salt from water, you would stir the two together to create a homogenous mixture. Then you would boil the mixture; all the water would evaporate, leaving behind the salt
Explanation:
I got 0.001912 using dimensional analysis. See the picture for work.
Answer:

Explanation:
First, find the molar mass of calcium (Ca). This can be found on the Periodic Table.
Next, find the number of moles.
Avogadro's Number tells us the number of atoms in one mole.
Therefore, there are 6.023*10²³ atoms in 1 mole.
We have 6.023*10²³ atoms of calcium, so it must also be 1 mole of calcium.
Finally, find the mass. Set up a proportion using the molar mass of calcium.

Multiply. The moles (mol Ca) will cancel.


There are <u>40.08 grams </u>in 6.023*10²³ atoms of calcium.
Answer:
8 gm
Explanation:
NaOH molar weight = 22.989 + 15.999 + 1.008 = 39.996 gm
.5 M would contain 1/2 of this per liter = 19.998 gm
now you only want 400/1000 of a liter = 7.9992 gm ~ 8gm