The formula for phosphorus is P4
The question is incomplete, here is the complete question:
Calculate the mole fraction of the ionic species KCl in the solution A solution was prepared by dissolving 43.0 g of KCl in 225 g of water.
<u>Answer:</u> The mole fraction of KCl in the solution is 0.044
<u>Explanation:</u>
To calculate the number of moles, we use the equation:
.....(1)
Given mass of water = 225 g
Molar mass of water = 18 g/mol
Putting values in equation 1, we get:

Given mass of KCl = 43 g
Molar mass of KCl = 74.55 g/mol
Putting values in equation 1, we get:

Mole fraction of a substance is given by:

Moles of KCl = 0.577 moles
Total moles = [0.577 + 12.5] = 13.077 moles
Putting values in above equation, we get:

Hence, the mole fraction of KCl in the solution is 0.044
Answer: humans would find more efficient ways of growing crops
Explanation:
Answer:No of moles of potassium sulfide (K2S)=0.61671moles
Explanation:
No of moles is given as Mass/ molar mass
Here Mass of potassium sulfide (K2S) =68 grams
Molar mass of potassium sulfide (K2S) = 39.0983 x 2 + 32.065 =110.2616 g/mol
No of moles =68 grams /110.2616 g/mol
=0.61671moles
Answer:
It will take 12 hours to settle out same particulate with half the diameter from same chimney.
Explanation:
The settling rate of particulates = S
Diameter of the particulate = d

The settling rate of one type of particulates = 
Diameter of the one type of particulate = 
The settling rate of other type of particulates = 
Diameter of the other type of particulate = 




Given that settling of one type of particulate from chimney is 2 days.So settling of other type of particulate from same chimney:

1 day = 24 hours
0.5 days = 0.5 × 24 hours = 12 hours
It will take 12 hours to settle out same particulate with half the diameter from same chimney.