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Silicon is widely used in the semi-conductor industry. Its isotopes and their anatomic masses are:Si-28 (27.9769amu), Si-29 (28.9765amu), and Si-30 (29.9794amu) Which is the most abundant?
For an ensemble consisting of a mole of particles having two energy levels separated by 1000. cm-1, at what temperature will the internal energy equal
What is the partial pressure of He in a container that is at a total pressure of 2.33 atm and contains
Oxidation-Reduction Reaction Use the half-reaction method to balance the following oxidation-reduction reaction under basic conditions. Physical states are not required. Write each balanced half-reaction and the final balanced net ionic equation.
acetyl-coa carboxylase is a key regulatory enzyme in fatty acid synthesis. early studies on the molecular properties of
Calculate the transformation rate for the austenite-to-pearlite transformation at 650 °C and at 600 °C. Show the relationship(s) you used to arrive at your answers.
A sample of clay was obtained from a point below the groundwater table. A moisture content test on this sample produced the following data
1)Acetic acid, CH3COOH, is a weak monoprotic acid (pKa=4.74 at 25oC). What is the pH of 0.191 mol/L CH3COOH(aq) at 25oC? Give your answer accurate to two decimal places. 2)Diethylamine, (C2H5)2NH, is a weak base (pKb=3.16 at 25oC)
What should be the final volume of a solution containing 50.5g of solid KMnO4 be in order to prepare a 0.745 M solution
Draw resonance structures for each of the following molecules or ions: a) HCO2^- (C is the central atom); b) N2O (N N O).
The temperature increased by 10.08 oC. Use these data, plus the information given below for CO2 and H2O, to estimate the standard enthalpy of formation, of H, at 25 oC for this compound of H values at 25 oC for CO2(g) and H2O(l) are 394 kJ mol 1 a..
Acetylene, C2H2, is a gas commonly used in welding. It is formed in the reaction of calcium carbide, CaC2, with water. Given the thermochemical equations, calculate the value of ?H°f for acetylene in units of kilojoules per mole.
Calculate the volume of O2 at STP required for the complete combustion of 4.23 L of acetylene (C2H2) at STP.
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