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Explain is the mass percent of a solution if 42.9 grams of aspirin is dissolved into 175mL of ethanol? Density of ethanol is 0.789 g/mL
calculate the molecular mass of paba a common sunscreen agent. when 8.32g of paba is dissolved in 150.0g of chloroform
Calculate the number of electrons transferred in the following reaction when it is correctly balanced. C5H8O(g) + O2(g)---> CO2(g) + H2O(l)
A 1g sample of carbon obtain from material found in a ancient site gave 7900 carbon-14 disentegrations in a 20-hour period. In the same amount of time 1g of carbon from a source found yesterday under went 18,400 disintegrations.
Calculate the time to drain water at 20C from a vertical tank 1.7 m in radius from a depth of 13 m to 1.6 m through a 1 cm in radius pipe 12 m long connected vertically at the bottom of the tank. Take η = 1 cP where 1P = 1 g/(cm s)
Calculating Volume, Pressure & Density, Calculate the density, in g/L, of SO2 at 75°C and 1.33 bar. (Round your answer to two decimal places)
Calculate the quantity of NH3 is produced upon reaction of 4.0 moles of water and 65.0 g of CaCN2.
how long will it take for the concentration of A to decrease from 1.0 M to 0.25 M? If [Bo] = 1.5 M, what will be the concentration once [A] = 0.25 M?
Calculate the pH of 1.00 L of a buffer that is 0.130 M HNO2 and 0.190 M NaNO2. What is the pH of the same buffer after the addition of 1.00 mL of 12.0 M HCl. (pKa of HNO2 = 3.40)
The simplest alkene has the formula C2H4 and the simplest cycloalkene has the formula C2H2
Depict the structures of the compounds as well as predict whether they can diffuse across a membrane without facilitated diffusion. Define why did you come to the conclusion.
what is the O-N-O bond angle in NO3- (a) less than 109.5degree (b) 109.5 degree (c) 120 degree (d) greater than 120 degree
nbspka for cyanic acid hcno 3.5 x 10-4 at 25degc . write the equilibrium that corresponds to ka. the standard heat of
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