Explanation:
-In NaCl, the sodium ion is the positive one. The chloride ion is the negative one.
-In Ca3P2, the calcuim ion is the positive one. The phosphide ion is the negative one
-In Rb2S, the rubidium ion is the positive one. The sulfide ion is the negative one
-In AlBr3, the aluminum ion is the positive one. The bromide ion is negative
-The K2Se, potassium ion is the positive one. The selenide ion is the negative one
-The BaO, the baruim ion is the positive one. Oxygen ion is the negative one
Answer: -
15.55 M
35.325 molal
Explanation: -
Let the volume of the solution be 1000 mL.
Density of nitric acid = 1.42 g/ mL
Total Mass of nitric acid Solution = Volume of nitric acid x Density of nitric acid
= 1000 mL x 1.42 g/ mL
= 1420 g.
Percentage of HNO₃ = 69%
Amount of HNO₃ =
= 979.8 g
Molar mass of HNO₃ = 1 x 1 + 14 x 1 + 16 x 3 = 63 g /mol
Number of moles of HNO₃ =
= 15.55 mol
Molarity is defined as number of moles per 1000 mL
We had taken 1000 mL as volume and found it to contain 15.55 moles.
Molarity of HNO₃ = 15.55 M
Mass of water = Total mass of nitric acid solution - mass of nitric acid
= 1420 - 979.8
= 440.2 g
So we see that 440.2 g of water contains 15.55 moles of HNO₃
Molality is defined as number of moles of HNO₃ present per 1000 g of water.
Molality of HNO₃ =
= 35.325 molal
Different between potential energy and mechanical energy
Answer:
i'm thinking 27.6 not sure
Explanation:
Answer:
Explanation:
Dimensional analysis uses the fact that any number can be multiplied by one without changing its value.
You want to convert hectometres to metres, so you multiply the hectometres by a conversion factor that equals one.
For example, you know that hecto means "× 10², so
1 hm = 100 m
If we divide each side by 1 hm, we get 1 = 100 m/1 hm.
If we divide each side by 100 m, we get 1 hm/100 m = 1.
So, we can use either (100 m/1 hm) or (1 hm/100 m) as a conversion factor, because each fraction equals one.
We choose the former, because it has the desired units on top.
The calculation becomes