<span>Answer:
2COâ‚‚ (g) + 6Hâ‚‚ (g) → CHâ‚OCHâ‚ (g) + 3Hâ‚‚O (â„“)
Now make this reaction up from what you are given:
2 Ă— (COâ‚‚ (g) + 3Hâ‚‚ (g) → CHâ‚OH (l) + Hâ‚‚O (â„“).. â†H° = –131 kJ)
... (2CHâ‚OH (l) → CHâ‚OCHâ‚ (g) + Hâ‚‚O (â„“) .. â†H° = 8kJ)
––––––––––––––––––––––––––––––––––––––... add
2COâ‚‚ (g) + 6Hâ‚‚ (g) → CHâ‚OCHâ‚ (g) + 3Hâ‚‚O (â„“) . - exactly what you want!
â†H° = 2(–131 kJ) + 8 kJ = –254 kJ</span>
A change will only occur one time in unidirectional.
Because
Cyclic : Cyclic compounds are chemical compounds having a basic non-linear structure. In other words, these are ring structures. One or more series of atoms in the compound is connected to form a ring structure.
Periodic : The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic number.
Unidirectional : compound is operating or moving in one direction only and it does not move in other direction.
Bidirectional : Capable of reacting or functioning in two, usually opposite, directions.
Thus, A change will only occur one time in unidirectional.
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That answer is 2.12 mol H2O
Explanation:
Sol. 450 ml there is LiCl 200 g
Sol. 1000 ml there is LiCl 200/450×1000
= 444.44 g
Molar = g/molar mass = 444.44/42.394 = 10.48 M
mass of pentane = 22.5g
molar mass of pentane(C5H12) = 5 x 12.01 + 12 x 1.008
= 60.05 + 12.096
= 72.146g/mol
= 72.15g/mol
<u>22.5g</u><u> pentane</u> x <u>1 mol pentane</u> x <u>6.022 x 10^23</u><u> molecules ofpentane</u>
72.15g pentane 1 mol pentane
= <u>22.5 x 6.022 x 10^23 </u>
72.15
= 1.88 x 10^23 pentane molecules
1 pentane molecule has 5 C + 12 H atoms = 5+12 = 17 atoms
Hence;
1.88 x 10^23 pentane molecules x <u> 17 atoms </u>
1 pentane molecule
= 31.925 x 10^23 atoms
= <u>3.2 x 10^22 atoms </u>are present in 22.5g of pentane.
<u> 3.2 x 10^22 atoms</u>