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An element has 3 stable isotopes with natural abundances of 11%, 17%, and 72%. The masses of those isotopes are 19.9, 21.9, and 22.9 amu respectively. What is the average atomic mass of this element?
an aqueous antifreeze solution is 48.5 ethylene glycol c2h6o2 by mass. the density of the solution is 1.062
When 4.6 mol O2 is heated at a constant pressure of 3.25 atm, its temperature increases from 252 K to 300. K. Given that the molar heat capacity of O2 at a constant pressure is 29.4 JK-1 mol-1, calculate q, ?H, and ?U.
A balloon is filled to a volume of 9.00 multiplied by 102 mL at a temperature of 18.0°C. The balloon is then cooled at constant pressure to a temperature of 1.00 multiplied by 102 K. What is the final volume of the balloon?
A 21.496g sample of magnesium is burned in air to form magnesium oxide and magnesium nitride. When the products are treated with water, 2.813g of gaseous ammonia are generated. Calculate the amounts of magnesium nitride and magnesium oxide formed.
A gas mixtue of Ne and Ar has a toal pressure of 4.00 atm and contains 16.0 mol of gas. If the partial pressure of Ne is 2.75 atm, how many moles of Ar are in the mixture
Also, at the end 1.31 g of 4,4-dimethyl-2-cyclohexen-1-one was obtained. My question how to calculate percent yield for 4,4-dimethyl-2-cyclohexen-1-one and theoretical yield for this lab.
A hydrogen atom with an electron in its ground state interacts with a photon of light with a wavelength of 1.22 × 10^?6m. Could the electron make a transition from the ground state to a higher energy level? If it does make a transition,
What velocity must an electron have in order to have a de Broglie wavelength of 1.00 A? What velocity must a proton have in order to have the same de Broglie wavelength
The rate constant of a reaction is 2.75*10^-5 L/mol*s at 195 c and 3.75*10^-3 L/mol*s at 258 c. What is the activation energy of the reaction
identify the absorptions associated witht he carbonyl group and with the aromatic rings
The gas-phase decomposition of N2O5 is the first-order process with a rate constant of 1.50 x 10^-3s^-1 at 55*C. The decomposition is:
In the reaction of lithium, li with nitrogen n2 three lithium atoms react with on nitrogen atom elements lose one electron, atoms of the other element gain three electrons
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