How much heat (in kilocalories) is needed to convert 1.00 kg of ice at 0°C into steam at 100°C?
a. 23.9
b. 79.6
c. 564
d. 643
e. 720
e
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When a gas undergoes an isothermal process, there is
A) no work done by (or on) the gas. B) no heat added to the gas. C) no change in the volume of the gas. D) no change in the temperature of the gas. E) no change in the pressure of the gas.
A 100 eV electron and a 100 eV proton have equal de Broglie wavelengths
Indicate whether the statement is true or false
During the volcanic eruption of Mt. Pelee in 1902, an incredibly hot "burning cloud" rolled down the mountain and incinerated the town of Saint-Pierre. From the damage done, the temperature in the cloud was estimated at 700°C. If the air temperature was 20°C and a mole of air is 29 grams, estimate the molecular weight of the gas in the "burning cloud" that made it heavier than the surrounding air. (As a follow-on, estimate the most probable composition of the cloud. Some typical volcanic gases are H2S, SO2, H2SO4, CO2, NO.)
What will be an ideal response?
Assuming that the outside air pressure is standard, 101.3 kPa, what pressure must one generate inside the mouth in order to drink water through a straw whose opening is 12 cm above the water surface?
A. 94.5 kPa B. 102.5 kPa C. 100.1 kPa D. 89.5 kPa