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(Solved): 1) How many grams of MgBr2 are in 7.27 x 1022 molecules of magnesium bromide (Mg ...



1) How many grams of MgBr2 are in 7.27 x 1022 molecules of magnesium bromide (MgBr2)?

Mg = 24.01 g/mol

Br =  79.90 g/mol

Additional Information:

  • If needed, use the periodic chart values from the printable Periodic chart provided with this course.
  • If needed use 6.022 x 1023 for Avogadro's number.

Format your answer:

  • With three significant figures
  • Include the correct unit.

Enter your answer in decimal form with 3 sig figs. Use the proper abbreviation for the units.

2) How many grams of chlorine atoms are present in a 3.73 g sample of barium chloride (BaCl2)?

Enter your answer in decimal form with the correct number of sig figs. Use the proper abbreviation for the units.

3) Selenium dichloride, SeCl2, has a molar mass of 149.86 g/mol.  What is the mass in grams of 0.555 moles of SeCl2? Use the common abbreviation for the units.



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Answer 1.) 22.2 g Explanation: Mole relationship gives the relationship between number of moles , number of molecules and mass of compound ( for compounds) It can be written as follows: 1 mol = 6.022 × 1023 molecules = molar mass in grams Atom
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