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a 7.96 sample of a compound containing the elements C, H, and S is burned and found to form 16.65 mg of CO2. The sulfur in 4.31 mg of the compound is converted into sulfate by a series of reactions, and precipitated as BaSO4. The BaSo4 was found to have a mass of 11.96 mg. The molecular weight of the compound was found to be 168 g/mol. Using this data, what is the molecular formula of the C, H, S compound?
solution requires 18.6 mL of 0.200 M NaOH to reach the end point of the titration, what is the molarity of the acetic acid solution? CH3COOH (aq) + NaOH(aq) CH3COONa (aq) + H2O(l)
The activation energy for the reaction NO 2 (g)+CO 2 (g)?NO(g)+CO(g) is E a = 100kJ/mol and the change in enthalpy for the reaction is ΔH = -200kJ/mol. What is the activation energy for the reverse reaction?
A balloon filled with 39.1 mol helium has a volume of 876 L at 0.0 C and 1.00 atm pressure. The temperature of the balloon is increased to 38.0 C as it expands to a volume of 998 L, the pressure remaining constant.
What effect on the boiling point of a liquid is produced by: a) The presence of a soluble non-volatile impurity?
Determine What is the final concentration and calculate what is the Ksp of this salt at temperature of 25 degrees Celsius?
The normal boiling and freezing points of substance X are 87.3 K and 84.0 K respectively. The triple point is at 82.7 K and 0.68 atmosphere. a. Draw a phase diagram for substance X. Label the regions in which the s,l, and g phases are stable.
A sample of steam with a mass of 0.550 g and at a temperature of 100C condenses into an insulated container holding 4.50 g of water at 6.0C. Assuming that no heat is lost to the surroundings, what will be the final temperature of the mixture?
Find the velocity of an electron emitted by a metal whose threshold frequency is 2.15×1014 {rm s^{-1}} when it is exposed to visible light of wavelength 4.76×10-7 {rm m}.
An iron ore sample is a mixture of Fe2O3 and several impurities. A 752. g sample of the impure iron ore is heated with excess carbon. Only the Fe2O3 present in the ore reacts with the carbon producing 341. g of carbon monoxide by the following rea..
The pH of a sample of rain is found to be 4.0. Calculate the percentage of HSO4- that is ionized in this sample, given that the acid dissociation constant for the second stage of ionization of H2SO4 is 1.2E-2.
The specific heat of silver is 0.235 J/g·K. Its melting point is 962°C, and its heat of fusion is 11.3 kJ/mol. What quantity of heat, in joules, is required to change 7.50 g of silver from solid at 25°C to liquid at 962°C?
Calculate the density of a block.
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