Answer:
Total pressure is 1396 mmHg
Explanation:
By:
PV/RT = n
It is possible to obtain the initial moles of nitrogen gas, where:
P is pressure (725 mmHg = 0,954 atm)
V is volume (0,755L)
R is gas constant (0,082atmL/molK)
T is temperature (25,0°C = 298,15 K)
Replacing:
n = 0,02946 moles of nitrogen gas.
The moles of dry ice (CO₂; molar mass= 44,01 g/mol) are:
1,20 g × (1mol/44,01g) = 0,02727 moles of dry ice.
When dry ice sublimes, total moles are:
0,02727 + 0,02946 =<em> 0,05673 moles</em>
With the temperature (25,0°C = 298,15 K) and volume (0,755L) it is possible to obtain total pressure, thus:
P = nRT/V
Replacing:
P = 1,837 atm × (760 mmHg/1atm) = <em>1396 mmHg</em>
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I hope it helps!
