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Calculate the density of dry air at 70 F from its average molecular mass given that the composition of dry air is 78.04 mole percent nitrogen, 20.95 mole percent oxygen, .934 mole percent argon, .0350 mole percent carbon dioxide and .00182 mole percent neon.
calculate the mass of propylene glycol that must be added to 0.500 kg of water to reduce the vapor pressure by 4.60
It is hard to begin inflating a balloon. A pressure of 800.0 KPa is required to initially inflate the balloon to 225.0 mL. What is the final pressure when the balloon has reached it's capacity of 1.2 L
A 250.0 -mL buffer solution initially contains 2.5X10^-2 M of HCHO2 and 2.5X10^-2 M of NaCHO2. What mass of the correct reagent should you add. pH 4.10
lithium iodide has a lattice energy of -730 kjmol and a heat ofhydration of -793 kjmol. determine how much heat is
changing the reaction buffer to extremly high ph with addition of sodium carbonate is said to stop the reaction. what 2 things are happening in the test tube upon addition of this caustic chemical be specific
Standard reduction potentials are given on the next page. (a) Draw a diagram of the electrochemical cell, labeling all electrodes and solutions. (b) What is the pH in the Pt | H+ | H2 half-cell (c) What is the value of the equilibrium constant for..
Draw Lewis structure for one important resonance form of HNO3 (HONO2). Include all lone pair electrons.
The absorbance of this mixture at the Mn wavelength was 0.128 and the absorbance at the Fe wavelength was 0.128. Find the concentration of the unknown Fe solution. (Note: In AAS each element is detected at its specific absorption wavelength)
The element boron has two naturally occurring isotopes with masses of 10.0129 amu and 11.0093 amu. What is the percent abundance of the second isotope?
What is the minimum volume of water needed to recrystallize 50 mg of phthalic acid? How much phthalic acis will remain in solution after recrystallization?
A flask contains 0.310 of liquid bromine, . Determine the number of bromine molecules present in the flask.
muscle cells need energy to contract. one biochemical pathway for energy transfer is the breakdown of glucose to
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