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Suppose you have 1.250g of the original thulium-167 with half life 7.990E + 05. Calculate how much of the original material will remain after 100 s, 1,000 s and 10,000 s.
Define how to calculate the power use of the refrigerator and how to calculate the value of A if the room temperature is 25 degrees Celsius.
A mole is equal to 6.02 x 10^23. 10 moles of hydrogen atoms are placed in a container. The hydrogen atoms are removed and counted one by one. What will the final count of hydrogen atoms be
Given the Ksp values for the following precipitates, please predict which precipitate has the largest solubility in the presence of 0.01 M of its composing anions (e.g., in the presence of 0.01 M Cl- ion for AgCl(s))
A person inhales air richer in O2 and exhales air richer in CO2 and water vapor. During each hour of sleep, a person exhales a total of 300. L of this CO2-enriched and H2O-enriched air.
what amount of solid sodium acetate is needed to prepare a buffer at ph 5.2 from 500 ml of 0.10 m acetic acid? the pka
The half-life for a first-order reaction is known to be 379 seconds at a given temperature. What is the rate constant at this temperature?
Use VSEPR theory to decide which one of the following molecules and ions will definitely have at least one 90º bond angle in it.
if 2.20 l ofa gas at 754 torr and 580 ml of gas at 0.988 atm are combined and allowed to diffuse in a 6.00l container
When a 8.37-g mixture of methane, CH4, and ethane, C2H6, is burned in oxygen at constant pressure, 445.8 kJ of heat is liberated. What is the percentage by mass of CH4 in the mixture
a chiral carboxylic acid a c5h6o2 reacts with 1mol of hydrogen gas on catalytic hydrogenation. the product is anachiral
Calculate the heat absorbed by 15.0 g of water to raise its temperature from 20.0oC to 50.0oC at constant pressure. The specific heat of water is 4.18 J/g.oC
Ethan contain 2.659 carbon and .668 gm of H, and one sample of acetylene contains 4.59 g of carbon and .382 gm of h. write emperical formula for ethane , acetylene
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