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The half-life for the reaction at 550C is 81.3 seconds. How long does it take for 89% of phosphine sample to decompose?
The minerals chalcocite (Cu2S) and malachite (Cu2CO3(OH)2) are two primary sources of copper. What is the oxidation state of copper in each of these minerals?
calculate the wavelength of the photon emitted when an electron drops from 4d obital to a 2p orbital in a hydrogen atom using Rydberg constant as 1.097 x 10-2 pm-1 .
Calculate the minimum energy that a bird of mass 25 g must expend in order to reach a height of 50 m.
Determine how many moles of gas were added to the container If the pressure raised to 800. torr,?
Blood is essentially an aqueous solution but it must transport a variety of non polar substances hormones for example
A new global sustainable business and industry incubator network is expanding into a Paris suburb. They want to make the newly acquired building and operations more environmentally friendly.
Tris is widely used in a biochemical laboratory. Its acid dissociation constant is 8.32 x 10^-9. You have available at your lab bench a 0.1 M solution of Tris in its protonated form, 0.1 M solution of HCL and NaOH,
A helium-filled balloon at sea level has a volume of 2.5 L at 0.989 atm and 33°C. If it is released and rises to an elevation at which the pressure is 0.900 atm and the temperature is 29°C, what will be the new volume of the balloon?
how much energy is required to warm 100g of H2O from 20 degrees celcius to 80 degrees celcius if it is initially in a 140g glass flask? the specific heat of water is 4.18 J/g degree celcius.
If a mixture of gases contained 78% nitrogen at a pressure of 984 torr and 22% carbon dioxide at 345 torr, what is the total pressure of the system?
how many joules of heat are needed to completely vaporize 24.40 g of water at its boiling point?
A 275-g sample of nickel at 100.0C is placed in 100.0 mL of water at 22.0C. What is the final temperature of the water.
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