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Current convention defines 1 amu as exactly 1/12 the mass of an atom of the isotope 12C. Since most elements occur naturally in well-established fixed relative abundances of different isotopes, the so-called Atomic Mass for a particular element represents a weighted average of the masses of the individual isotopes. For example, naturally occuring carbon is a mixture of 98.90% 12C (12.000000 amu) and 1.10% 13C (13.003355 amu) plus a trace of 14C (14.003241 amu). The Atomic Mass of carbon is found to be 12.011 amu.A Molecular Mass is the sum of the (averaged) Atomic Masses for all atoms in a molecule.
What is the Molecular Mass of H2SeO3?
if 2.325g of an unknown acid compound is made up to 200.0 mL with water. 10.00 mL of the resulting solution requires 15.43 mL of 0.1808 M NaOH.
The inert pair effect is observed for : A) Group IIIA and Group IVA elements B) Group IVA elements C) Group IIIA elements D) group IIA elements E) group IA elements
A sample of a liquid hydrocarbon know to consist of molecules with five carbon atoms is vaporized in a .204 L flask by immersion in a water bath at 101?. The barometric pressure is 767 torr, and the remaining gas weighs .482 g. What is the molecul..
what two steps in the reaction are accelerated by the presence of strong acid, and what function does the acid play in each of these steps
A volume of 10.0 mL of a .00300 M solution of Cl- ions are reacted with .500 M solution of AgNO3-. What is the maximum mass of AgCl that precipitates in grams.
The individual standard electrode potentials do not indicate anything about tendency to gain electrons. The cell potential of the entire cell does.
Why must we the wavelength bet set to 447nm when the FeSCN2+ solution is an orange-brown colour
calculate enthalpy change for the quantity of zinc reacted. Be sure to follow the significant figures convention in the answer you report.
A sample of helium gas has a volume of 8.23 L at 258.8 K and 2.049 atm. How many helium molecules does it contain
Calculate the wavelength of light that would be required to excite an electron from the HOMO to the LUMO. Hint: Recall that (triangle)E=hv=hc/lambda, and that 1 eV=1.602 x 10^-19 Joules.
The aspirin componet weighs only 250mg. What is the w/w% aspirin inthe time release tablet?
nbspa solution of 0.100 m acetic acid is prepared.a what is its ph value? b if 20 of the initial acetic acid is
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