7 g of table salt is add to water in a dish. The dish is then heated until all the water evaporates. Assuming no chemical reactions occurred, what mass of salt should be left in the dish? answers: 1g, 7g, 14, and No salt left behind

7 grams

Explanation:

The water evaporates leaving the same amount of salt behind

hope this helps...

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.