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777dan777 [17]
2 years ago
12

Determine the percent composition by mass of the element carbon in the acetamide compound

Chemistry
1 answer:
makvit [3.9K]2 years ago
6 0
The formula of acetamide is C2H5NO
It contains 2 atoms of carbon 
The atomic mass of carbon is 12; therefore 2 atoms of carbon contains 24 g
The mass of 1 mole of acetamide is 59.07 g/mol
Therefore; the percentage of carbon in asetamide will be'
 =24/59.07 ×100
 = 40.63 %
 
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How many grams are there in 3.4 x 10^24 atoms of He?
Lelechka [254]

Given :

Number of He atoms, n = 3.4\times 10^{24} atoms.

To Find :

How many grams are their in given number of He atoms.

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What volume of O2(
irakobra [83]
Answer is: volume of oxygen is 4.63 liters.
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n(C) = m(C) ÷ M(C).
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n(C) = 0.375 mol.
From chemical reaction: n(C) : n(O₂) = 2 : 1.
n(O₂) = 0.1875 mol.
T = 48°C = 321.15 K.
p = 810 mmHg ÷ 760 mmHg/atm= 1.066 atm.
<span>R = 0.08206 L·atm/mol·K.
Ideal gas law: p·V = n·R·T.</span>
V(O₂) = n·R·T / p.<span>
V(O₂) = 0.1875 mol · 0.08206 L·atm/mol·K · 321.15 K / 1.066 atm.</span><span>
V(O₂<span>) = 4.63 L.</span></span>
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3 years ago
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