Predict the change in enthalpy due to the combustion of 10.0 g of propane. Assuming that the molar heat of combustion of propane is -2043.9 kJ/mol.

During an experiment, a student reacts aqueous phosphoric acid and excess aqueous sodium hydrogen carbonate. 

The net ionic equation that represents the reaction that occurs at the second equivalence point in the experiment is

In what ways do I share a responsibility toward the betterment of humanity with my All-Star team?

You are asked to design a rollercoaster. It will have ten attached cars, each of which will have a mass of 500 kg and carry six people with average mass of 70.0 kg. You want to design a vertical circular loop with a radius of 55.0 m. The centre of the circle would have a height of 71.0 m above the ground. Assume the track is frictionless.

Calculate the minimum speed the rollercoaster cars would have to have at the top of the circle in order to continue around the circle and not fall off the track.

Calculate the mechanical energy of the cars at the top of the circle, with respect to the ground.

Calculate the speed of the cars when they are 40? below the horizontal

 Calculate the amount of tension on the track when the cars are 40? below the horizontal.

Calculate the maximum amount of tension that the rollercoaster track would have to withstand within the loop. Include a free body diagram of the cars and specify the location in the circle.

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Identify the SOA and SRA 

A solution of iron (ii) chloride is mixed with an acidified sodium nitrate solution

SOA: 

SRA:

An engineering company is hired to improve the efficiency of a transmission line. In their report, they discuss ways that will allow them to reduce the current by a factor of four. Assuming that this is done, by what factor will the power losses be reduced?

when 24.0g of carbon and 10.0g of hydrogen are placed in a bomb calorimeter and reacted to according to the equation 3C (g) + 4H2(g)  = C?H?.(propane) (g) + 103.8kJ, the maxium amount of heat liberated by this reaction is 

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two ropes are attached to a heavy box to pull it along the floor. One rope applies a force of 475 N due west, the other applies a force of 315 N due south. What is the net force exerted on the box