Ethanol, CzH5OH, is an organic chemical compound used in medical wipes and most commonly in antibacterial
2 answers:
Answer:
13.04 %
Explanation:
First, find the Molecular mass of the individual elements present in the compound.
Carbon = 12
Hydrogen = 1
Oxygen = 16
Then, find the total mass of C₂H₅OH
(12 × 2) + (1 × 5) + 16 + 1 = 46
In order to find the percentage mass of hydrogen, you must take the Molecular mass of hydrogen in the compound, divide it by the Molecular mass of the compound and times that by 100.
% by mass of hydrogen = × 100
[it is 1 × 6 because 1 is the mass of hydrogen and there are 6 hydrogen atoms in C₂H₅OH]
% by mass of hydrogen = 13.04 %
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Answer:
q = - 2067.2 J of Heat is giving out when 85.0g of lead cools from 200.0 c to 10.0 c.
Explanation:
The Specific Heat capacity of Lead is 0.128
This means, increase in temperature of 1 gm of lead by will require 0.128 J of heat.
Formula Used :
q = amount of heat added / removed
m = mass of substance in grams = 85.0 g
c = specific heat of the substance = 0.128
= Change in temperature
= final temperature - Initial temperature
= 10 - 200
= -
put value in formula
q = -
On calculation,
q = - 2067.2 J
- sign indicates that the heat is released in the process