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How you take care of crayfish?
You will need:Gravel in your tankAt least 20gal. or more for more than 1 crayHeater (water has to be from 70 deg. F- 75deg. F)FilterPlantsThey eat peas shrimp pellets carrots cucumberWater will have to be cleaned 1 a weekDO NOT FORGET TO LET THE WATER SIT 24HRS BEFORE YOU PUT IT IN THE TANK SO THE CHLORINE EVAPORATES!
How much heat is needed to vaporize 7.24 ml of sweat from your skin at 25 degree c?
If you assume that the density of sweat is the same as that of water (1g/ml) and that the specific heat of sweat is the same as that of water (4.184 J/g/deg), then one can estimate the heat required to evaporate 7.24 ml of sweat at 25 degrees Cheat to raise 7.24 ml from 25º to 100º = q = mC∆T = (7.24g)(4.184 J/g/deg)(75deg) = 2272 J heat to evaporate 7.24 ml = q = m∆Hvap = (7.24g)(2260 J/g) = 16,362 J Total heat = 2272 J + 16,362 J = 18,634 J = 18.6 kJ
Calculate the heat given to a 500g steel containing 450g of water to raise the temp from 25degrees Celsius to 100The specific heat capacity of steel.510 Steel and water have the same temp changes?
The water and pot(/) have a temperature increase of 100-25 degrees C that is 75 degrees. the formula Q=mass * SH* change in temperature can be used for both the water and the steel pot Hence for steel pot Q=510 j/kg/degC*.5kg*75Deg C=19125 joule. For water SH=4187 j/kg/C QW= .45*4187*75=141311 joule total heat (neglecting changes and losses to get the water to 100 deg C is 160436 joule or 160.4 kjoule. Note this does not boil the water it only raises the temperature to 100 degrees C. to boil the water requires approximately a futher 1250 kJ
