Exercise 2.58. Part A: Determine the number of Kr atoms in a 5.55 âˆ’mg sample of krypton. Part...

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Chemistry

Exercise 2.58. Part A:Determine the number of Kr atoms ina 5.55 âˆ’mg sample of krypton.
Part B:Determine the molar mass, M, of anelement if the mass of a 2.80Ã—1022âˆ’atom sample of the element is2.09 g.
Part C: Determine the identity ofan element if the mass of a2.80Ã—1022âˆ’atom sample of the element is 2.09 g.(Answer choices: titanium.potassium, scandium, calcium.)
Exercise 2.56. Withoutdoing detailed calculations, indicate which of the followingquantities contains the greatest number of atoms: 6.022Ã—1023Niatoms, 25.0 g nitrogen, 52.0 g Cr, 10.0cm3 Fe(d=7.86g/cm3). (answer choices: Ni, Nitrogen, Cr, Fe)
Excercise 2.62. A particular leadâ€“cadmium alloy is 8.0% cadmiumby mass. What mass of this alloy, ingrams, must you weigh out to obtain a sample containing6.30Ã—10²³ Cdatoms? Express your answer using two significantfigures.
Exercise 3.6 Determine the mass,in grams, of,
Part A 7.32 molN2O4
Part B 3.22Ã—10²⁴ O2 molecules
Part C 18.8 molCuSO4â‹…5H2O
Part D 4.14Ã—10²⁴ molecules of C2H4(OH)2
Excercise 3.11
Part A molesof N2O4 in a 145 âˆ’gsample
Part B N atomsin 43.5 g of Mg(NO3)2
Part C N atomsin a sample of C7H5(NO2)3 that has the same number of O atoms as12.4 g C6H12O6
thank you in advance^^

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Exercise 258 Part A Determine the number of Kr atoms in a 555 mg sample of krypton Solution The atomic weight of Kr 83798gmole Moles in 555mg Mass Atomic weight 006623 moles Number of atoms Moles X Avagadros number 006623 X 6023 X 1023 398 X 1022 atoms Part BDetermine the molar mass M of an element if the mass of a 2801022atom sample of the element is 209 g Solution Mass of 2801022 atoms 209grams Mass of 6023 X 1023 atoms 4496 g Molecular weight 4496g mole Part C Determine the See Answer

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