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  3. -- i can calculate the formula mass but get confus

-- I can calculate the formula mass but get confused with the various conversions between different...

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Chemistry

-- I can calculate the formula mass but getconfused with the various conversions between different types ofunits. I have the correct answers but I am trying to learn how towork through the problems to get the correct answer.

10) A sample of talc, Mg3Si4O10(OH)2, has a mass of 0.664 g.Calculate the number of mmoles of Mg3Si4O10(OH)2.

11) A sample of gypsum, CaSO4•2H2O, has a mass of 22 g.Calculate the number of moles of CaSO4•2H2O.

12) A sample of potassium dichromate, K2Cr2O7, has a mass of 578Gg. Calculate the number of moles of K2Cr2O7.

13) A pure sample contains 660 moles of potassium dichromate,K2Cr2O7. What is the mass of the sample?

14) A pure sample contains 3.0 x 10-8 moles of gypsum,CaSO4•2H2O. What is the mass of the sample in units of ng?

15) A pure sample contains 8.8 x 10-2 moles of talc,Mg3Si4O10(OH)2. What is the mass of the sample?

16) A pure sample contains 1.5 moles of ammonium carbonate,(NH4)2CO3. What is the mass of the sample?

The answers are

10) 1.75 mmoles Mg3Si4O10(OH)2

11) 0.13 moles CaSO4•2H2O

12) 1.96 x 109 mol K2Cr2O7

13) 1.94 x 105 g K2Cr2O7

14) 5165 ng CaSO4•2H2O

15) 33.4 g Mg3Si4O10(OH)2

16) 144.1 g (NH4)2CO3

Answer & Explanation Solved by verified expert
4.0 Ratings (740 Votes)
10 molar mass ofMg3Si4O10OH2 3792657 gmmol that mean 1 mole ofMg3Si4O10OH2 3792657 gmno of mole massmolar mass0664 gmofMg3Si4O10OH2    See Answer
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