Moles He = 7.83 x 10^24 / 6.02 x 10^23 =13.0
<span>mass He = 13.0 mol x 4.00 g/mol = 52.0 g</span>
It depends on the substance,but for most substance it is in the gaseous state.
Answer:
HCl(aq) + KOH(aq --> KCl(aq) + H₂O(l)
Explanation:
A cracker which contains starch,is test positive with iodine solution but not Benedict's solution. This is because Benedict's solution is used to test for reducing sugars like glucose,galactose,fructose,maltose and lactose.In this case, the cracker is added with amylase enzyme which hydolyses starch into maltose,thus benedict's solution is test positive
Given :
A mixture of water and acetone at 756 mm boils at 70.0°C.
The vapor pressure of acetone is 1.54 atm at 70.0°C, while the vapor pressure of water is 0.312 atm at the same temperature.
To Find :
The percentage composition of the mixture.
Solution :
By Raoult's law :
......( 1 )
Also , 
......( 2 )
Solving equation 1 and 2 , we get :
.
Mass of acetone ,
Mass of water ,
Hence , this is the required solution.
