Why are rocks not alive
2 answers:
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Answer:
Explanation:
From the information given :
we can understand the solute is glucose and the solvent is water,
So, the weight of glucose = 20.23 g
the molecular weight of glucose = 180.2 g/mol
weight of water = 95. 75 g
the molecular weight of water = 18.02 g/mol
pure vapor pressure of water at 27°C
moles of glucose = weight of glucose/ molecular weight of glucose
= 20.23/180.2
= 0.11 mole
moles of water = weight of water / molecular weight of water
= 95.75/18.02
= 5.31 mole
mole fraction of glucose (moles of glucose)/(moles of glucose+ moles of water)
0.11/(0.11 + 5.31)
0.0203
mole fraction of glucose (moles of water)/(moles of water+ moles of glucose)
5.31/ (5.31 + 0.11)
0.9797
Using Raoult's Law:
where:
= vapor pressure of the solution
= total vapor pressure of the solution
= vapor pressure of the solvent in the pure state
= mole fraction of solvent i.e. water
95.75 × 0.9797
93.81 mmHg
the total vapor pressure of the solution = 93.81 mmHg
Answer:
9.24% the percent of Mg in the mixture.
Explanation:
Mass of silver bromide = 1.1739 g
Moles of silver bromide =
1 mole of AgBr has 1 mole of bromine atom.Then 0.006244 moles AgBr has 0.006244 mole bromine atom.
Moles of bromine atoms = 0.006244 moles
Magnesium bromide has 2 moles of bromine atom.Then 0.006244 moles of bromine atoms will be in :
Magnesium bromide has 1 mole magnesium atom, then 0.003122 moles of magnesium bromide will have :
magnesium atom
Mass of 0.003122 moles of magnesium :
0.003122 mol × 24 g/mol = 0.07493 g
Mass of the sample = 0.8107 g
Percentage of magnesium in the sample ;
9.24% the percent of Mg in the mixture.