An element consists of 0.19% of an isotope with mass 135.907 amu, 0.25% of an isotope with mass 137.9060 amu, 88.45% of an isotope with mass 139.9054 amu, and 11.11% of an isotope with mass 141.9092 amu. Calculate the average atomic mass, and identify the element.

Q: chemist adds 1.35 L of a 1.72 mol/L sodium thiosulfate (Na₂S₂O3) solution to a reaction flask.…

A:

Q: Explain how the calculated the Dihedral angle of the 2 methyle groups to be 90 degrees?

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Q: How many N atoms are present are in a 3.13 ng sample of nitrobenzene, c6h5no2? Answer should be in…

A: Given,mass of nitrobenzene ( C6H5NO2 ) = 3.13 ng

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Q: Name the following compound. - No i

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Q: 1) SAMPLE MASSES: X, Mass of sample (g) = Y, Mass of benzoic acid (g) = Z. Mass of pellet (g) = Ms.…

A: Given that,Mass of sample (X) = 0.7 gMass of benzoic acid (Y) = 0.3 gMass of pellet (Z) = 0.9 g

Q: b Draw the additional resonance structure(s) of the structure below? H3C-N+

A: Resonance is the delocalization of electrons in a structure and is used when one single Lewis…

Q: What is the pH of a 0.1088 M carbonic acid solution (Ka1 = 4.3 X 10-7)?

A: The concentration of the given carbonic acid solution = 0.1088 M Ka1 = 4.3 x 10-7

Q: How will you convert p - nitrobromobenzene into p-chloromethoxybenzene?

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Q: Name the following compound.

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Q: Draw the missing lone-pair electrons and assign the missing formal charge on N or O for the…

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Q: Identify which trial produced the maximum amount of precipitate during the reaction between sodium…

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Q: Draw structural formulas for the alkoxide ion and the alkyl(aryl)bromide that may be used in a…

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Q: 20.0 mL of a 0.617 M lithium phosphide and 25.0 mL of a 0.592 M molybdenum (IV) chloride. What mass…

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Q: why wasnt pH used

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Q: 2.25. A piston having 0.033 mol of gas at 35.0°C expands from 0.77 L to 2.00 L, and the system…

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Q: Calculate the change in H when one mole of water is heated from 263 to 283 K given the molar…

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Q: What type of reaction is P4 + 3O2 > 2P2O3

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Q: a Draw a structure for the product of the acid-base reaction below. :0: + BF3

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Q: When 122. g of glycine (C₂H5NO₂) a are dissolved in 1350. g of a certain mystery liquid X, the…

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Q: Part F When 1.75 g of a soluble salt dissolves in 71.0 g of water in a coffee cup calorimeter, the…

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Q: Determine the number of atoms of O in 93.2 moles of Fe2(SO3)3

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Q: 75.0 mL of a 0.435 M solution of HNO₃ is diluted to 1200.0 mL. What is the new concentration of the…

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Q: Estimate the pl values of the following peptides: a. Ser-lle b. Gly-Tyr-Val

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Q: Draw the structure of the dipeptide Gly-His in its fully protonated form. Gly-His Incorrect он HN 3…

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Q: A sample of a hydrated salt weighs 2.8250 g before it is heated. After heating to a constant mass,…

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Q: 4. (5 pts) When 0.258 g of a molecular compound, benzoic acid, was dissolved in 40.0 g of benzene,…

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Q: 5. The rate of the reaction NO2+CO=NO+CO2 depends only on the concentration of nitrogen dioxide. The…

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Q: Deducing a rate law from initial reaction rate data Some measurements of the initial rate of a…

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Q: We needed to let the sample dry before we checked purity. How would we be able to use the melting…

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Q: A small amount of sodium chloride (NaCl) is dissolved in a large amount of water. Imagine separating…

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Q: Draw a skeletal ("line") structure of this molecule: O O I i C -CH₂ C- CH3 OH -CH-CH3 Click and drag…

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Q: (3) The unit cell length of NaCl is 5.63 Å. Determine the density of NaCl.

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Q: Answer questions a-c about the Bronsted acid-base reaction below using the identifying letters A-D…

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Q: How many total number of orbitals can have the following quantum numbers? n= 4; 1= 3 a) 1 b) 16 c) 5…

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Q: Draw the structure of the principal product?

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Q: compound KCI H₂PO4 K BrO 3 H₂PO3 type of compound (check all that apply) ionic 0 ✔ molecular acid X…

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Q: Using the above solubility curve, predict the solubility of sulfanilamide in 95% ethyl alcohol at 0…

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Q: A chemist adds 80.0 mL of a 0.189 mol/L aluminum sulfate (Al₂(SO4),) has added to the flask. Be sure…

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Q: The following chemical reaction takes place in aqueous solution: 2 Fe(NO3)(aq) +3 K₂S(aq)…

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Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.