WILL MARK BRAINLIEST In the following reaction. oxygen is the excess reactant: SiCl4 + O2 -> SiO2 + Cl2.
The table shows an experimental record for the above reaction:
Trial 1: Starting amount of SiCl4 is 150g, Starting amount of O2 is 200g, and actual yield of SiO2 is 49.2g.
Trial 2: Starting SiCl4 is 75g, O2 is 50g, and actual yield of SiO2 is 25.2g.
A: Calculate the percentage yield for SiO2 for trial 1. Also determine the leftover reactant for the trial. Show your work.
B: Based on the percentage yield in trial 2, explain what ratio of reactants is more efficient for the given reason.

Urea, co(nh2)2, is manufactured on a large scale for use in producing urea-formaldehyde plastics and as a fertilizer. what is the maximum mass of urea that can be manufactured from the co2 produced by combustion of 1.00 x 104 grams of co2?

Since the gas in your graduated cylinder is a mixture of butane and water vapor, you must determine the partial pressure of the butane, pbutane, alone. to do this, consult a reference and record the partial pressure of the water vapor, pwater, at the temperature you recorded. use the following formula to compute the partial pressure of the butane. pbutane = atmosphere - pwater use the following combined gas law formula and compute the volume that the butane sample will occupy at stp. (hint: convert both temperatures to kelvin.) pbutane x voriginal = pstandard x vfinal troom tstandard use the following ratio and proportion formula to determine the mass of butane needed to occupy a volume of 22.4 l at stp. grams of butane you used “x” grams of butane ml of butane corrected to stp = 22,400 ml compute the theoretical molar mass of butane based on its formula and the atomic masses on the periodic table. compare your experimental results from #3 to the theoretical value of #4, computing a percent error of your findings using this formula: % error = measured value - accepted value x 100 accepted value use the following ratio and proportion formula to determine the mass of butane needed to occupy a volume of 22.4 l at stp. need asap

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?