Question

389 mL of decane were injected into a 1000 L tank containing 1 atm oxygen (O2) at 32 degrees C. The mixture was ignited using electric discharge, and all the decane reacted with oxygen forming carbon dioxide and water. the tank was then heated to 325 degrees C and the pressure P1 wsa measured at 10am. the tank was then cooled down until it reached -138 degrees C, and then the pressure P2 was measured. afterwards the contents of the tank were collected and seperated. the water was used to make lemonade for the scientists who performed the experiment, the carbon dioxide was converted to dry ice.

A. How many moles of gas were in the tank when the pressure P2 was measured?

A. 9

B.11

C.31

D.51

B. Pressure P1 was closest to _____

A. 1.0atm

B. 4.5atm

C. 25atm

D. 2.5atm

C. Pressure P2 was closest to ______

A. 0.5atm

B. 0.2atm

C. 0.1atm

D. 0.01atm

D. If every scientist drank at least 1 cup (8fl oz) of lemonade, how many scientists participated in the experiment?

A. 1

B. 2

C. 4

D. 0

Answer 1

The balanced chemical equation is

2C₁₀H₂₂ +31 O₂ 20CO₂ +22 H₂O  

sum of the coefficient of all reaction components are :

2+31+20+22= 75.

(1) How many moles of gas were there in a tank when the pressure P₂ was measured

31

(2) Pressure P1 is closet at

2.5atm

(3) Pressure P2 is closet at

0.1 atm

(4) If every scientist drank at least 1 cup (8fl oz) of lemonade, how many scientists participated in the experiment?

2.

There are 2 scientists participated in the experiment.