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At what temperature will air (MW=29) have the same density as helium at 300 K, both gases at the same pressure.
a) 2200 K
b) 41 K
c) 415 K
d) 600 K
e) 173 K
Copper is elctroplated from CuSO4 solution. A constant current of 4.00 amp is applied by an external power supply. How long will it take to deposit 1.00x10^2 g of Cu? The atomic mass of copper is 63.546.
She records the final temperature of the water as 317K. What is the value of Ccal (calorimeter constant) for the calorimeter.
How much heat is evolved when 233 g of ammonia gas condenses to a liquid at its boiling point?
Calculate the energy in joules and calories required to heat 24.0g water from 20.0C to 27.7C
500 mL of 0.22 M HCl and 500 mL of 0.20 M NaOH were added to a calorimeter. Assume both substances have a density of 1 g/mL and a specific heat capacity of 4.184 J/g°C.
For a certain glass electrode, the selectivity coefficient for Na+ relative to H+ is 1.0 x 10-12. The electrode is calibrated with NBS standard buffers 6.86 and 9.18,
An analysis shows that you need to neutral 3.27 meq/100gof acidity. How much of finely ground pure CaCO3 (in grams) is required to neutralize the acidity of this soil?
antacids which contain CaCO3 react with stomach acid to the equation . it gives the eq but I cant type it. what is the mass of stomach acid that reacts with 1.00 grams CaCO3 ?
the delta H OF vaporization for a new substance is 45 kj/mol and its delta H sublimation is 62 kj/mol, how much energy is needed for freezing 2.75 mol of a substance
A suitable storage place must be geologically stable long enough for the activity of plutonium-239 to decrease to 0.1% of its original value.
The other criterion is very basic and relates to whether simple or fractional is selected
The standard heat of formation of WO3(s) is -843 KJ/mol, and its standard molar entropy
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