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dominikbatt
30.05.2020 •
Chemistry
If all forces acting on an object the object must be
Traveling in a circle
Speeding up or slowing down
In the process of changing direction
At rest or traveling at a constant velocity
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Ответ:
C₅H₁₂
Explanation:
Using general law of gases we can determine the moles of the sample and, as we know the mass the molecular formula is the ratio between mass in grams per mole of susbtance. With this, we can find the molecular formula, thus:
Moles:
PV = nRT -General gas law-
Where P is pressure: 741mmHg * (1atm / 760mmHg) = 0.975atm
V is volume in liters: 672.0mL = 0.672L
n are moles -Our incognite-
R is gas constant: 0.0821atmL/molK
And T is absolute temperature: 273.15 + 35°C = 308.15K
Replacing:
n = PV/RT
n = 0.975atm*0.672L / 0.0821atmL/molK*308.15K
n = 0.0259moles
And molar mass is:
1.87g / 0.0259moles =
72.2g/mol.
In 72.2g/mol we can have just 5 moles of C:
5 moles of C will weigh: 12.01g/mol * 5 = 60.05g/mol
And the other mass must come from hydrogen:
72.2g/mol - 60.05g/mol = 12.15g/mol / 1.01g/mol = 12 moles of hydrogen
And molecular formula is:
C₅H₁₂