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Charcoal found under a stone at Stonehenge, England, has a carbon-14 activity that is 0.50 that of new wood. How old is the charcoal? (The half life of carbon-14 is 5,730 years.)
A. 5.7E3 years
B. 1.1E4 years
C.4.5E-3 years
D. 1.1E4 years
E. 5.7E3 years
at 400 K, the rate of decomposition of a gaseous compound initially at a pressure of 12.6 kPa, was 9.71 Pa/s when 10.0 % had reacted and 7.67 Pa when 20.0 % had reacted.Determine the order of reaction.
A 100g sample of water at 27oC is poured into a 76.2g sample of water at 89oC. What will be the final temperature.
The elemental mass percent composition of malonic acid is 34.63% C, 3.87% H, and 61.50% O. Determine the empirical formula of malonic acid. Express your answer as a chemical formula.
Silver chloride often used in silver plating contains 75.27% Ag. Calculate the mass of silver chloride in grams required to make 4.0 g of silver plating.
If the water initially has a temperature of 26 0C, how many kilojoules of heat must be removed to cool and freeze the water at 0 0C?
How many moles of oxygen will be produced if 27.6 grams of Al are produced?
1.If 2.47 g of salicylic acid is reacted with 61 mL methanol, what is the maximum mass of product (oil of wintergreen) that could be formed?
One method of estimating the temperature of the center of the sun is based on the assumption that the center consists of gases that have an average molar mass of 2.00 g/mol.
Draw structures corresponding to each of the given names. Draw: 2-fluoro-3-methylpentane, 3-cyclobutylpentane
Determine how much concentrated solution can you take to form 1.15 Litres of 0.105M Nitric acid by mixing with H 2 O?
What is the solubility of lead fluoride in a solution of 0.050 M of sodium fluoride?
Calculate the empirical and molecular formulae of A and B. Deduce the structural formulae of A and B. State the type isoerism exhibited by A and B.
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