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A 55.0g sample of impure zinc reacts with exactly 129 ml of hydrochloric acid. The hydrochloric acid has a density of 1.18 g/ml and contains 35.0% HCl by mass. What is the percent of the metallic zinc in the original sample. Assume that the impurity in the zinc does not affect the HCl.
How much heat is absorbed in the complete reaction of 3.00 grams of SiO2 with excess carbon in the reaction below? DH0 for the reaction is +624.6 kJ.
Write the chemical equation for all the reactions both SN1 and SN2 involving primary and secondary substrates
If the O2 was the excess reagent, 8.3 mol of H2S were consumed, and 137.1g of water were collected after the reaction has gone to complain, what is the percent yield of the reaction?
Determine the mass of aluminum acetate that can be made if you do the reaction with 125 grams of acetic acid and 275 grams of aluminum hydroxide.
Consider the reversible Carnot cycle shown in the following figure given below with 1.21mol of an ideal gas with CV=5R/2 as the working substance. The initial isothermal expansion occurs at the hot reservoir temperature of Thot = 760K from an init..
calculate the amount of sodium nitrate in mg in one liter if 3.8mg of nitrate was detected in one liter of water.
E85 fuel is a mixture of ethanol and gasoline. What mass in kilograms of E85 (d=0.758g/mL) can be contained in a 14.0 L gallon tank.
Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What percent (by moles) of He is present in a helium-oxygen mixture having a density of 0.508g/L at 25C and 721mmHg?
The concentration of oxygen, O2, dissolved in a sample of seawater is 6.22 ppm by mass (concentration 1 ppm - 1 part per million - means
Find the expected freezing point of a water solution that contains 268 g of aluminum nitrate, Al(NO3)3, in 8.50 kg of water.
The total concentration of enzyme in the reaction was 10 mmol/mL. What is thekcat (K2) of this reaction?
Show how many µL of protein sample you will take and add with the desired volume of DTT and Laemmli buffer to make the right concentration of sample.
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