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Large deposit of gold are found in veins of rock and can be seperated chemically by a two-step process:
(1) 4 Au+ 8 NaCN+ O2+ H2O ---- 4 NaAu(CN)2 + 4 NaOH
(2)2 NaAu(CN)2 + Zn ---- 2 Au + Na2(ZN(CN)4)
If a 1000 kilogram sample of rock is 0.021% gold by mass, how much zinc is needed to react with the gold extracted from the rock? Assume that the reaction is 100% efficient.
A patient weighs 165 pounds and is to receive a drug at a dosage of 45.0 mg per kg of body weight. The drug is supplied as a solution that contains 25 mg of drug per mL of solution. How many mL of the drug should the patient receive?
One liter of a buffer solution is prepared by dissolving 0.150 mol of NaNO2 and 0.070 mol of HCl in water. What is the pH of this solution? If the solution is diluted two fold with water, what is the pH?
If 6.15 mol of ethane (C2H6) undergo combustion according to the unbalanced equation C2H6 + O2 -! CO2 + H2O, how much oxygen is required
Suppose that the microwave radiation has a wavelength of 10.7 cm. How many photons are required to heat 200. mL of coffee from 25°C to 65°C?
if 25g of aluminum are allowed to react with 50.g of hydrochloric acid, how many grams of the product, aluminum chloride can be produced? equation.
how many grams of lead chromate form when a 1.00g sample of Pb(NO3)2 is added to 25.0 mL of 1.00 M K2CrO4 solution
Sketch a molecule of Pbr3Cl2 in which the chlorines are in axial position position. Sketch another molecules of Pbr3Cl2 in which the chlorines are equatorials positions.
If a gas occupies 625 mL at 0 Celsius and 760 torr pressure, what will its volume be at 373 degree C and 1520 torr pressure? How would you describe how to separate a mixture of oil, sand, and saltwater.
determine the final volume of the gas If the gas ocupied 68mL, initally and determine the molarity of the solution
If it takes 34.0 mL of 0.0250 M K2Cr2O7 to titrate 10.0 mL of a solution containing Fe2+, what is the molar concentration of Fe2+.
Calculate the standard-state entropy for the following reaction: 1 \rm CH_4(g) + 2 \rm O_2(g) \longrightarrow 1 \rm CO_2(g) + 2 \rm H_2O(l) (If applicable, coefficients of one have been included for clarity.)
Find the ?H for the reaction below, given the following reactions and subsequent ?H values: Zn(s) + 1/8S8(s) + 2O2(g) ? ZnSO4(s) Zn(s) + 1/8S8(s) ? ZnS(s)
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