A43.0%/57.0% by volume propane/n-butane mixture is cooled from 367°c to 163°c. flnd the change in ethalpy of this mixture by following the steps below. assume ideal behavior a) what is the average molar mass of the mixture? number g/mol b) what is the change in specific enthalpy of pure propane from 367°c to 163°c? number kj/ mol c) what is the change in specific enthalpy of pure n-butane from 367°c to 163 c? number kj/ mol
d) what is the change in specific enthalpy of the mixture from 367°c to 163°c? number kj/ mol e) what is the change in enthalpy of the mixture from 367°c to 163'c in kj/kg? number kj/ kg

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

How have the greenhouse gasses increased from the year 2000 to 2018

Air pressure is measured in pascals. for a professional american football game, the ball should be inflated to about 90,000 pascals. scientists studied the effects of air temperature on the pressure inside american footballs by taking these steps: 1. prepare 100 footballs. 2. measure each football's air pressure. 3. divide footballs into 10 groups. 4. place the groups in different lockers cooled to different air temperatures. 5. after 12 hours, remove the footballs from lockers. 6. measure each football's pressure again. 7. compare the new pressures to the starting pressures. what two terms best describe the variable "air pressure inside the football" in this experiment? independent, qualitative independent, quantitative dependent, qualitative dependent, quantitative