<span>100.
ppb of chcl3 in drinking water means 100 g of CHCl3 in 1,000,0000,000 g of water
Molarity, M
M = number of moles of solute / volume of solution in liters
number of moles of solute = mass of CHCl3 / molar mass of CHCl3
molar mass of CHCl3 = 119.37 g/mol
number of moles of solute = 100 g / 119.37 g/mol = 0.838 mol
using density of water = 1 g/ ml => 1,000,000,000 g = 1,000,000 liters
M = 0.838 / 1,000,000 = 8.38 * 10^ - 7 M <----- answer
Molality, m
m = number of moles of solute / kg of solvent
number of moles of solute = 0.838
kg of solvent = kg of water = 1,000,000 kg
m = 0.838 moles / 1,000,000 kg = 8.38 * 10^ - 7 m <----- answer
mole fraction of solute, X solute
X solute = number of moles of solute / number of moles of solution
number of moles of solute = 0.838
number of moles of solution = number of moles of solute + number of moles of solvent
number of moles of solvent = mass of water / molar mass of water = 1,000,000,000 g / 18.01528 g/mol = 55,508,435 moles
number of moles of solution = 0.838 moles + 55,508,435 moles = 55,508,436 moles
X solute = 0.838 / 55,508,435 = 1.51 * 10 ^ - 8 <------ answer
mass percent, %
% = (mass of solute / mass of solution) * 100 = (100g / 1,000,000,100 g) * 100 =
% = 10 ^ - 6 % <------- answer
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Answer:
+5
Explanation:
it hs 5 more protons thant electrons, so it has a positive charge of 5
Answer:
[KOH] = 1.47 M
[KOH] = 1.22 m
KOH = 6.86 % m/m
Explanation:
Let's analyse the data
1.87 L is the volume of solution
Density is 1.29 g/mL → Solution density
155 g of KOH → Mass of solute
Moles of solute is (mass / molar mass) = 2.76 moles.
Molarity is mol/L → 2.76 mol / 1.87 L = 1.47 M
Let's determine, the mass of solvent.
Molality is mol of solute / 1kg of solvent
We can use density to find out the mass of solution
Mass of solution - Mass of solute = Mass of solvent
Density = Mass / volume
1.29 g/mL = Mass / 1870 mL
Notice, we had to convert L to mL, cause the units of density.
1.29 g/mL . 1870 mL = Mass → 2412.3 g
2412.3 g - 155 g = 2257.3 g of solvent
Let's convert the mass of solvent to kg
2257.3 g / 1000 = 2.25kg
2.76 mol / 2.25kg = 1.22 m (molality)
% percent by mass = mass of solute in 100g of solution.
(155 g / 2257.3 g) . 100g = 6.86 % m/m
The arrangement of atoms in a mineral can change its physical and chemical properties.
Diamonds and coal are both made of carbon, however, their chemical and physical properties are very different.
