Answer:
Explanation:
<u>1) Convert the mass of water into number of moles</u>
- Molar mass of water: 18.015 g/mol
- Number of moles, n = mass in grams / molar mass
n = 255 g / 18.015 g/mol = 14.15 mol
<u>2) Use the formula E = n × ΔH vap</u>
This is, you have to multiply the molar ΔH vaporization by the number of moles to find the total energy to boil the given amount of water.
- E = 14.15 mol × 40,650 J/mol = 575,395.5 J
<u>3) Round to the correct number of significant figures.</u>
The mass of water is the measurement with the least number of significant figures (3), so you must report the answer with 3 significant figures,
The number of transferred electrons to form the ionic bond in one formula unit of each compound is as below
NaCl = 1 electron
CaS = 2 electrons
BaO= 2 electrons
KBr=1 electrons
LIF = 1 electron
explanation
ionic bond is formed between a metal and a nonmetal . This bond is formed when electron are transferred between cation and anion. To know how many electrons transferred you look the oxidation state of the metal.
for example
in NaCl only one electrons is transferred since Na is in oxidation state of +1. Na donate the one electron to Cl to form an ionic bond. Ba is in oxidation state of 2+ and hence it donate the two electrons to O to form ionic bond.
Porque es Clara y no contiene quimicos
We are given the compounds:
0.2 mol pb(ch3coo)2, 0.1 mol na2s, and 0.1 mol cacl2
Pb will react with both S and Cl to form a solid compound,
therefore:
Pb+2 + S-2 ---> PbS(s) <span>
Pb+2 + 2Cl- ---> PbCl2(s) </span><span>
<span>Lead(II) sulfide and Lead(II) chloride will precipitate.</span></span>
The result of this would be H₂O.
H₂0, is nothing but water.
A chemical reaction is occurring.
Hope this helps! :D
