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Calculate the change in temperature for 4.5g of CaCl2 dissolved in 90.0mL of H20. Assume that calorimeter absorbs no heat. (Ccal=0)
how many moles can be produced from 2.5 moles of Ag2CO3 and final temperature of the calorimeter contents is 23.83°C After dissolution of the salt.
iF 0.80g of a gas occupies 295 mL at 25 degrees Celcius and 680 mm Hg of pressure, what is the molar mass of the gas.
Write a structural formula for two different isomers of [Co(H2O)2(en)2]Cl2. Indicate the oxidation state of the Co in each case.
A 1.17 g sample of an alkane hydrocarbon gas occupies a volume of 674 mL at 28°C and 741 mmHg. Alkanes are known to have the general formula CnH2n+2.
As gas expands from 1.00 L to 2.50 L against constant pressure of 820 torr. Calculate the change in internal energy for the gas, if 120 J of heat is transferred to the gas during the expansion.
The solubility product of PbBr2 is 8.9x10^-6. Determine the molar solubility in the following. (a) pure water (b) 0.20 M KBr solution (c) 0.15 M Pb(NO3)2 solution
What mass of solid sodium formate (of MW 68.01)must be added to 115 mL of 0.57 mol/L formic acid (HCOOH) to make a buffer solution having a pH of 4.16? Ka = 0.00018 for HCOOH.
How much copper metal can be obtained by the single replacement reaction between copper (1) nitrate and 30.0g of iron metal. (iron (2) nitrate is formed.)
Calculate the amount of energy present in the following photons and find the region of electromagnetic spectrum for each.
A gaseous compound is 78.14 percent boron and 21 86 percent hydrogen . At 27 degrees celcius, 74.3 ml of gas exerted a pressure of 1.12 atm.
Explain what is methylphenidates purpose and its chemical structure? Also determine how does it affect the body of human beings ,what makes up that compound , what organs do it impact?
Calculate the mass of one oxygen atom and determine the number of oxygen atoms in a 10.00g sample of the element.
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