-- 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
