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For a normal distribution with a mean of 222 and a standard deviation of 31, what is the z value (distance from the mean) for a random value to be 270 (use 2 decimal digit)
A 4.05 g sample of a compound containing only C, H, and O was burned completely. The only combustion products were 10.942 g CO2 and 4.476 g H2O. What is the empirical formula of the compound.
Explain how and why the aqueous solubility(Cw,sat) and vapor pressure (Pv) for phenol differs when its pure natural state only ( non aqueous phase liquid [NAPL] vs. a mixed NAPL solution that contains 20% naphthalene and 80% phenol?
What are the relative percentages of hydrogen cyanide (HCN) and cyanide ion in a dilute aqueous solution at pH
What is the energy of 100 photons of Light? And what are the steps?
Find out the ( Number of waters of hydration -Molecularweight -Mass of water in one mole -Mass NOT water in mole-Mass percent water )
Octet rule refers to how elements generally prefer to form bonds so as to attain an octet configuration, i.e. have 8 electrons in their valence shell.
The density of citronellal, a mosquito repellant, is 1.45 g · L-1 at 365C and 50.0 kPa. What is the molar mass of citronellal?
A 53.6 gram sample of an unknown substance contains 11.5 grams of carbon. What is the percent by mass of carbon in the compound?
Which one of these samples contains the smallest number of molecule A) 1.0L of H2 at STP(0c and 1atm) B) 1.0L of N2 at STP. C) 1.0 L of H2at 20 c and 760 torr. D) 1.0L of N2 at 0c and 800torr. E) 1.0 L of He at STP
The volume of isoamyl alcohol reactant is 20.0 mL and the density of isoamyl alcohol is 0.809 g/mL. I need to find the mass and moles of isoamyl alcohol.
The SI unit of time is the second, which is defined as 9,192,631,770 cycles of radiation associated with a certain emission process in the cesium atom. Calculate the wavelength of this radiation
Use these data, plus the information given below for CO2 and H2O, to estimate the standard enthalpy of formation, ofH?, at 25 oC for this compound. ofH? values at 25 oC for CO2(g) and H2O(l) are ?394 kJ mol?1 and ?286 kJ mol?1, respectively
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