Answer:
17.6kJ
Explanation:
The mass of ethanol given is 161.g
Now we first find the number of moles from this.
Number of moles = 
Molar mass of C₂H₅OH = 2(12) + 5(1) + 16 + 1 = 46g/mol
Number of moles of ethanol = 
= 3.5mol
Since the heat of fusion is 5.02kJ/mol;
Heat of fusion is a measure of the amount of energy needed to melt a substance.
Amount of energy needed to melt = 3.5mol x 5.02kJ/mol
= 17.6kJ
Answer:
H₂O + CO₂ → H₂CO₃
Option D is correct.
Law of conservation of mass:
According to this law, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
Now we will apply this law to given chemical equations:
A) H₂ + O₂ → H₂O
There are two H and two O atoms present on left side while on right side only one O and two H atoms are present so mass in not conserved. This option is incorrect.
B) Mg + HCl → H₂ + MgCl₂
In this equation one Mg, one H and one Cl atoms are present on left side of equation while on right side two H, one Mg and two chlorine atoms are present. This equation also not follow the law of conservation of mass.
C) KClO₃ → KCl + O₂
There are one K, one Cl and three O atoms are present on left side of equation while on right side one K one Cl and two oxygen atoms are present. This equation also not following the law of conservation of mass.
D) H₂O + CO₂ → H₂CO₃
There are two hydrogen, one carbon and three oxygen atoms are present on both side of equation thus, mass remain conserved. This option is correct.
This is true because it reacts with oxygen
Answer: Potassium is 39.10 g/mol
Explanation: The numbers below the element are the molar mass.
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