How many moles of sulfur atoms are present in 2.00 moles of cs2 ?

4 mol

C + 2S = CS2

1 mol of CS2 contains 2 mol of sulfur

So 2 mol of cs2 contains 2*2 mol of S

2mol CS2 x 2 mol S/ 1 mol CS2 =

4 mol S

There are 4 moles of sulfur atoms present in 2.00 moles of carbon sulfide.

Explanation:

In 1 mole of carbon sulfide there are 1 mole of carbon atoms and 2 moles of sulfur atoms.

Then moles of carbon  in 2 moles of carbon sulfide ;

of carbon atom

Then moles of sulfur in 2 moles of carbon sulfide ;

of sulfur atom

There are 4 moles of sulfur atoms present in 2.00 moles of carbon sulfide.

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%

the product of the pressure and volume is also constant