Answer:
1.8321 kg
Explanation:
The given 1 kg of coal contains 50% of the carbon atom by mass. Thus, mass of carbon in coal is
Also, 1 kg = 1000 g
So, mass of carbon = 500 g
The formula for the calculation of moles is shown below:
Molar mass of carbon = 12.0107 g/mol
Moles of methanol = 500 g / 12.0107 g/mol = 41.6295 moles
Considering the reaction:
From the reaction,
1 mole of C react to form 1 mole of
So,
41.6295 moles of C react to form 41.6295 moles of
Moles of = 41.6295 moles
Molar mass of = 44.01 g/mol
So, Mass = Moles × Molar mass = 41.6295 moles × 44.01 g/mol = 1832.1143 g
Also, 1g = 0.001 kg
<u>So, amount of released = 1.8321 kg</u>
Answer:
8.95 g
Explanation:
- ZnCl₂ (aq) + 2 KOH (aq) → Zn(OH)₂ (s) + 2 KCl (aq)
First we <u>calculate how many ZnCl₂ moles reacted</u>, using<em> the given concentration and volume</em>:
- 0.360 M * 0.250 L = 0.090 mol ZnCl₂
Then we <u>convert ZnCl₂ moles into Zn(OH)₂ moles</u> [ Zn(OH)₂ is the precipitate, as it is the solid]:
- 0.090 mol ZnCl₂ * = 0.090 mol Zn(OH)₂
Finally we<u> convert 0.090 Zn(OH)₂ moles into grams</u>, using its <em>molar mass</em>:
- 0.090 mol Zn(OH)₂ * 99.424 g/mol = 8.95 g
Answer:
B
Explanation:
A. Is wrong
This definition in this option does not fully define what an open system entails. It only gave a one sided definition of the phenomenon on ground
B is correct
In an open system, matter and energy should be free to leave
C is incorrect
This is clearly a one sided definition like A and should not be taken serious
D is incorrect
D is talking essentially about what a closed system is
Modern periodic table is arranged on the basis of element's increasing "Atomic numbers"
Hope this helps!
Pure water has the lowest freezing point among the others.