1 2 3 4 5 Complete the table below for calculating the molar

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2.)

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4.)

5.)

Complete the table below for calculating the molar mass of the compound sulfur tetrafluoride. Molar mass of element Moles Mass in one mole of sulfur tetrafluoride g/mol x g/molx mol g/molx Molar mass sulfur tetrafluoride- g/mol

Solution

   molar mass of element         mass in one mole of sulfur tetrafluoride
S        32g/mole * 1 mole        =   32g
F        19g/mole * 4 mole        =   76g

molar mass of sulfur tetrafluoride = 108g/mole

       formula    Molar mass of ion     Number of ions     Mass of ion in one mole of silver fluoride
Cation   Ag^+      108g/mole         * 1 mole               108g
Anion    F^-        19g/mole         * 1 mole                19g
   molar mass of silver fluoride = 127g/mole
3.
molar mass of C3H8O   = 12*3+ 1*8+16*1 = 60g/mole
The percent by mass of oxygen in C3H8O = 1*16*100/60   = 26.67%
4.
molar mass of N2O = 14*2 + 16 = 44g/mole
Mass percnetage of nitrogen = 2*14*100/44 = 63.63%
Mass percentage of oxygen    = 1*16*100/44   = 36.36%

no of moles of Fe = W/G.A.Wt
                   = 42.04/56   = 0.75 moles
mass of S          = mass of metal sulfide- mass of Fe
                   = 78.26-42.04 = 36.22g
no of moles of S   = W/G.A.Wt
                   = 36.22/32 = 1.13 moles
Fe : S           = 0.75 : 1.13
                   = 1    : 1.5
                   = 2    : 3
the empirical formula is Fe2S3