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To my students,

Problems' Solution 10/30/08

1)
Given: 2.50 mol Ca
Find: ? g Ca
Solution: 2.50mol Ca x 40.08 g Ca/ 1mol = 100.2 g Ca ~ 100. g Ca Answer

2)
Given: t= 1week
Find: t+? minutes
Solution: 1week x 7days/week x 24hr/day x6o min/hr
1(7)(24)(60)= 10080 min Answer
3)
Given: d= 1.59 g/cm^3
m= 4.0g
Solution: d =m/v v=m/d = 4.0g/ 1.59 g/cm^3 = 2.53 cm^3 ~ 2.5 cm^3 Answer

4)
Given: m=6.005 g C
molar mass= 12.010 g/mol
Find: ? mol C
Solution: 6.005gCx 1molC/12.010g V = 0.5000 mol C Answer

5)
Given: diamond d= 3.5g/cm^3
v= 0.071 cm^3
Find: m=? g
Solution: d=m/v m=dv
= (3.5g/cm^3)(0.071cm^3)
= 0.25 g of diamond