Answer:
33.8 m
Explanation:
(a) We want to know the molality of nitric acid in a concentrated solution of nitric acid (68.0% HNO₃ by mass).
Step 1: Determine the mass of HNO₃ and water in 100 grams of solution.
Step 2: Convert the mass of HNO₃ to moles.
Step 3: Convert the mass of water to kilograms.
Step 4: Calculate the molality.
(b)
Step 1
In 100 g of solution, there are 68.0 g of HNO₃ and 100 g - 68.0 g = 32.0 g of water.
Step 2
The molar mass of HNO₃ is 63.01 g/mol. The moles corresponding to 68.0 g are:
68.0 g × (1 mol/63.01 g) = 1.08 mol
Step 3
The mass of water is 32.0 g = 0.0320 kg
Step 4
The molality of HNO₃ is:
m = moles of solute / kilograms of solvent
m = 1.08 mol / 0.0320 kg
m = 33.8 m
Density (p) = Mass / volume
P=295/15.625
=18.88
therefore p=18.88
Answer:
boron has one valence electron
Hope this helps you mate ♪ ♬ ヾ(´︶`♡)ﾉ ♬ ♪♪＼(*＾▽＾*)／＼(*＾▽＾*)／♡⃛◟(
Chemical
Electric
Friction
Geothermal
Nuclear
Solar i think is the last one
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