chemistry problems2?
I am doing some exercises and need to check answers!
1. total energy of content of a cake 8754kJ.
Exercising hard on a bicycle will use about 100W. How long will the cake provide energy for a cyclist? ans=24.3hours?ans might be wrong
the cake requires 200cm3 of CO2 (at 200C) to make it rise. reaction as follows
2NaHCO3 -> Na2CO3 + H2O + CO2
what mass of sodium hydrogen carbonate must be added to the cake mixture? ans=0.64g?
2. TNT is used as a blasting explosive. TNT can combust without an external supply of oxygen to give CO2, steam, nitrogen, soot and heat given out is 3400kJ/mol. Give balanced equation for the breakdown of tnt. If 200g of TNT is detonated in a sealed bore hole of diameter 25mm and length 50cm and the temp reaches 1200C what will be the pressure in the borehole? when the rock burst and hot fine carbon is exposed to air it will explode to form CO2 and CO will burn to give dioxide. estimate volume of gases after secondary combustion.
help will rewarded:)
moles=mass/mr 1 mole =24000cm3
200/24000 = 0.008moles
0.008=grams/(46.0+1+12+48)
0.008=grams/(107)
0.008×43.8=0.856grams
i’ll do the rest laters.
SDW-T 100W (white sodium) & CDM-T 70W (metal halide)
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