CHM110H5 Study Guide - Midterm Guide: Joule

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9 Feb 2016

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C12h22o11 per hour per hectare: 3. 295 x 105 kj h ha: a watt is a unit of power equal to one joule per second. 10,000 kj s ha x 3600 s h. Therefore, 3. 6 x107 kj h ha is the amount of solar energy: compare the amount of energy needed to produce of c12h22o11 (2) and the amount of solar energy to calculate the efficiency of photosynthesis (3): energy required percent efficiency= produce sucrose solar energy. = 3600kj h m: to calculate the square meters needed, compare the amount of kj per hour (3) and the amount of kj per hour per square meter (4): sqare meters needed= In this study, the minimum amount of surface area for a solar panel is determined to provide electricity for one house. On average household uses about 40 kwh of electricity per day. 1kw/m2 is equal to 1kj/sm2. So in one hour, 1kj/sm2 * 3600s will be equal to.

Related Questions

The sun supplies about 1.0 killowatt of energy for each square meter of surfave area (1.0 KW/ m^2 where a watt + 1kj/s) Plants produce the equivalent of about 0.20g of sucrose (C12 H22 O11) per hour per square meter. Assuming that the sucrose is produced as follows, calculate the percentage of sunlight used to produce sucrose 12 CO2(g) +11 H2O (l)---------------- C12H12O11 +12O2 (g) deltaH=5645 kJ

a.
The sun supplies energy at the rate of about 1.0 kilowatts persquare meter of earth (1 watt = 1 J/s). The plants in anagricultural field produce the equivalent of 20. kg of sucrose(C12H22O11) per hour per hectare (1 ha = 10,000 m2). Assume thatsucrose is produced by the reaction given below.
12 CO2(g) + 11 H2O(l) C12H22O11(s) + 12 O2(g) ?H = 5640 kJ
Calculate the percentage of sunlight used to produce the sucrose,that is, determine the efficiency of photosynthesis.
%

b.

On Easter Sunday, April 23, 1983, nitric acid spilled from a tankcar near downtown Denver, Colorado. The spill was neutralized withsodium carbonate.
2 HNO3(aq) + Na2CO3(s) 2 NaNO3(aq) + H2O(l) + CO2(g)
Calculate ?HÂ° for this reaction.
kJ
Approximately 5.0 104 gal nitric acid was spilled. Assume that theacid was an aqueous solution containing 50.0% HNO3 by mass with adensity of 1.42 g/cm3. How much sodium carbonate was required forcomplete neutralization of the spill? (?HfÂ° for NaNO3(aq) = -467kJ/mol.)
g
How much heat was evolved?
kJ
According to The Denver Post for April 4,1983, authorities fearedthat dangerous air pollution might occur during the neutralization.Considering the magnitude of ?HÂ°, what was their majorconcern?

c.
A piece of chocolate cake contains about 400 Calories. Anutritional Calorie is equal to 1000 calories (thermochemicalcalories), which is equal to 4.184 kJ. How many 9-inch-high stepsmust a 180 pound man climb to expend the 400 Cal from the piece ofcake? Assume that the energy used to climb steps is the same as theenergy required to lift a mass against the force of gravity,namely: PE = mgh, where m is the mass of the object lifted inkilograms, g is the gravitational constant (9.8 m/s2), and h is theheight the object is lifted in meters.
steps

CHM110H5 Study Guide - Midterm Guide: Joule

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