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An artifact has a carbon-14 decay rate of 9.53 disintegrations per minute per gram of carbon (9.53 dis/minxgC). Living organisms have carbon-14 decay rate of 15.3 dis/minxgC. How old is the artifact? (The half-life of carbon-14 is 5730 yr.)
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Calculate the percentage of solvent in the dried fabric by weight; and the concentration of solvent in the dryer exhaust in mg/m^3 if the exhaust is at 160 deg F and 1 atm.
A solid sample containing some Fe^2+ ion weighs 1.062 g. It requires 24.12 mL 0.01562 m KNno4 to titrate Fe^2+ in the dissolved sample to a pink end point
For a certain experiment, R-140a vapor is contained in a sealed glass tube at 20 degrees celcius. We want to know the pressure at this condition, but there is no means of measuring it since the tube is sealed
A 27.21 g sample of a substance is initially at 25.4 °C. After absorbing 2591 J of heat, the temperature of the substance is 199.8 °C. What is the specific heat (c) of the substance?
Calculate the percentage of He atoms at 100oC which have speeds in the range between 1200 m/s and 1300 m/s. Calculate the percentage of these He atoms that have speeds greater than 5000 m/s
Calculate the molarity of the solution produced by mixing the following substances. (Assume that the volumes are additive.) (a) 40.0 mL of 0.160 M NaCl and 65.0 mL of 0.133 M NaCl
silver iodide agl is less soluble in aqueous ammonia than either agbr or agcl. what two factors could contribute to
If a 1.40g sample of any alkene is combusted in excess oxygen, how many moles of water will form?
a tank at is filled with of carbon dioxide gas and of carbon monoxide gas. you can assume both gases behave as ideal
A compound contains the elements Ca and F. Analysis indicates that 2.94 g of sample of the compound contains 0.93 g calcium. Calculate the mass of fluorine in the sample.
How many grams of water are needed to react with 78.0g CaCN2? How many grams of NH3 are produced from 5.19g CaCN2?
Problem- What mass of oxygen (in kilograms) is contained in 3.00 gallons of ethanol (C2H5OH)? (The density of ethanol is 0.789 g/mL; 1 gal = 3.785 L).
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