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The element lead (Pb) consists of four naturally occurring isotopes with atomic masses 203.97302,205.97444,206.97587, and 207.97663 amu. The relative abundances of these four isotopes are 1.4,24.1,22.1, and 52.4 %, respectively. From these data, calculate the atomic weight of lead.
What is the difference between "knobs in holes" conformation versus "ridges in grooves" conformation, especially which type of alpha proteins would we typically find such conformations
A compound of elements X and Y has the molecular formula X2Y3. Let Mx be the atomic mass of element X and MY (subscript-y) be the atomic mass of element Y.
explain why addin eletcrons to a bonding orbital leads to bonding of an atom, in terms of electron distribution
An element forms a body-centered cubic crystalline substance. the edge length of the unit cell is 287pm and the density of the crystal is 97.92 g/mL. calculate the molar mass of the substance.
determine the specific heat of a material if a 35 g sample of the material absorbs 48 j as it is heated from 298 k to 313 k
translate the following word equations into unbalanced chemical equations and explain how the equations represent what
show a born cycle that allows the comparison of a homolytic bond dissociation energy with the heterolytic bond
Calculate the quantity of energy produced per mole of -235 (atomic mass = 235.043922 ) for the neutron-induced fission of -235 to produce -137 (atomic mass = 136.9253 ) and -97 (atomic mass = 96.910950 ).
Calculate the theoretical yield in grams of the precipitate formed. 3. If the actual yield of the experiment was 90.5 mg, what is the % yield of Ag3PO4
calculate the ph of a solution made from mixing 25.0 ml of 2.00 mhcl with 20.0 ml of 1.75 m ca oh2. giving thatcalcium
What is the pH at the equivalence point when when 40.0 mL of 0.183 mol/L HC7H5O2(aq) is titrated with 0.131 mol/L NaOH(aq)? Assume the temperature is 25oC
The syringe used in this experiment is calibrated to 60 mL. However, there is a 'dead volume' at the needle end of the syringe that is uncalibrated. This volume equals 1.20 mL. Bearing in mind that the syringe is upside down
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