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A sample of ammonia, NH3, contains 3.3 x 1021 hydrogen atoms. How many nitrogen atoms are in this sample?
Match the element to the subshell containing unoccupied or partially occupied orbitals. Rubidium Vanadium Boron Uranium Tungsten Magnesium A. 5d B. 2p C. 5f D. 3s E. F. 4s G. 3d H. 4d I. 5s J. 2s K. 4p
If all the chloride in a 4.348 g sample of an unknown metal chloride is precipitated as AgCl with 70.90 mL of .2010 M AgNO3, what is the percentage of chloride in the sample
Write the structural formulas for the products that form when 1-butene reacts with each of the following reagents: a) HI b) H2, Pt c) Dilute H2SO4, warm d) Cold concentrated H2SO4 e) Cold concentrated H2SO4, then H2O and heat
Barium chlorate in solution mixed with Silver fluoride
biological organisms live at great depths in the ocean and they have adapted their bodies to survive at extreme
A tripeptide made from the amino acids alanine, phenylalanine, and threonine is shown in this Jmol molecule. If the convention for naming peptides
A buffer was prepared by adding 2.4 g of ammonium nitrate to 100.0 mL of 0.30 M ammonia (Kb = 1.8 × 10-5). To this solution was then added 10.0 mL of 0.30 M sodium hydroxide
Give the x value followed by the y value, separated by a comma. Express your answer in the form x,y
The molar heat of vaporization at 298 K for diethyl ether(C4H10O) is 26.0 kj/mol. How much heat would be requiered to vaporize 0.714 g of ether at 289 K?
the specific heat of ethylene glycol is 2.42 J/g-K. How many J of heat are needed to raise the temperature of 62.0 g of ethylene glycol from 13.1 C to 40.5 C ?
A copper wire (density = 8.96 g/cm3) has a diameter of 0.39 mm. If a sample of this copper wire has a mass of 43 g, how long is the wire?
a student makes 215 ml of a 3.15m solution of na2so4. he then forgets to seal it and some water evaporates overnight.
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