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1)Hemoglobin is the protein that transports oxygen in mammals. Hemoglobin is 0.342% Fe by mass, and each hemoglobin molecule contains four iron atoms. Calculate the molar mass of hemoglobin. 2)Gallium, Ga, has two isotopes of atomic mass 68.926 u and 70.926 u. Write the full symbol for each isotope (give both A and Z for each isotope). How many protons, and how many neutrons are present in the nucleus of each isotope? What is the natural abundance of each isotope, if the average atomic mass of gallium is 69.72 u?
If 545 mL of oxygen gas is collected at 21ºC and 754 mm Hg, what is its volume at STP?
A 6.50-g sample of copper metal at 25.0 C is heated by the addition of 84.0 J of energy. The final temperature of the copper is ____ C.The specific heat capacity of the copper is 0.38J/g-K.
when 50.0 mL of 0.5M NaCl solution is combined with 100.0mL of 0.20M Na2SO4 solution, what is the concentration of sodium ions in the final solution.
Compute the activation energy for this reaction when The half-lives were found to be 161 min at 199 Celsius and 12.5 min at 230 celsius? The isomerization of methyl isocynide follows first order kinetics.
A compound of forumula C14H12 gave a positive Baeyer test and burned with a yellow, sooty flame. Treatment with ozone followed by hydrolysis in the presence of zinc gave formaldehyde as one of the products.
4 KO2 + 2 H2O + 4 CO2 ==> 4 KHCO3 + 3 O2 How many moles of O2 will be produced if 5.17 moles of CO2 react completely?
Determine the identity of the diatomic gas when a boy places 59.5 gm of a diatomic gas into a ten litres container at 25 degree Celsius (measures the pressure to be 2.053 atm. )
Conversion of aqueous formaldehyde to methylene glycol? Assuming that you have formaldehyde, CH2O, fully solubilized in water at a temperature of 200 degrees F, is the first order and natural reaction
At 25 degree celcius ,the second order reaction NOCL(g) - NO (g) + 1/2 CL2 (g) is 50 % complete after 5.82 hours when the initial concentration of Nitrosyl chloride is 4.46 ml/L.what time will it take for the reaction to be 75 % complete.
determine what mass of AgCl silver chloride can be formed from 1.03L of a 0.132M solution of AgNO 3 silver nitrate
What is the minimum concentration of ammonia that should dissolve AgBr to produce a 0.01 M Ag(NH3)2+ solution
A certain first-order reaction (products) has a rate constant of 6.90×10-3 s^{-1} at 45 C. How many minutes does it take for the concentration of the reactant, [A], to drop to 6.25% of the original concentration?
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