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The composition of gold is expressed in units of carats. Gold rated as 24 carat practically 100% gold. So, 24 carat gold is a pure substance an element. Twelve carat gold is only 50% gold. It is a mixture of gold and other metals. A 0.246 g sample of jewelry is analyzed and found to have 0.17 g of gold. What is the percent gold in the jewelry? What is the proper carat rating for this jewelry?
The expansion of an IDEAL GAS in a vacuum. Is it an endothermic process
What is the sum of all the coefficients in the balanced equation?
What is the maximum concentration of Cd2+ that can exist in a solution in which the S2- concentration is 2.5 x 10-6? Ksp(CdS) = 8.0 x 10-27
What mass of silver bromide will form when 25.00 mL of a 0.0675 M MgBr2 solution is combined with 30.00 mL of 0.100M AgNO3
Explain why it is important that the glassware and reagents used in a Grignard reaction are completely dry. Write an equation that describes what happens if phenylmagnesium bromide reacts with water.
What is the theoretical yield of acetic acid when 22.5 g of methanol reacts with 32.0 g of carbon monoxide in the following equation: CH3OH + CO --> HC2H3O2
At standard temperature, a gas has a volume of 371 mL. The temperature is then increased to 131C, and the pressure is held constant. What is the new volume?
What mass of potassium sulfate is produced when 45.6 g of KMnO4 reacts with 56.4 g of H2SO4? 4KMnO4 + 6H2SO4 --> 2K2SO4 + 4MnSO4 + 6H2O + 5O2
For propanoic acid (HC3H5O2, Ka = 1.3*e-5) find out the concentration of all species present, the PH as well as the percent dissociation of a 0.100 M solution.
A 25.95 -g sample of methanol at 35.6°C is added to a 38.65-g sample of ethanol at 24.7°C in a constant pressure calorimeter. If the final temperature of the combined liquids is 28.5°C and the heat capacity of the calorimeter is 19.3 J/°C, determi..
An 95.4-mL sample of wet O2 is collected over water at 21.3 degrees celcius at a barometric pressure of 741mmHg (vapor pressure of water at 21.3 degrees celcius = 19mmHg).
a mixture containing ironiii sulfide and ironiii chloride isreacted with hydrochloric acid.fe2s3 6hcl --gt 2fecl3
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