Study text: "Essential Mathematics and Statistics for Science", 2nd Edition,

G Currell & A A Dowman, Wiley-Blackwell, 2009

G Currell & A A Dowman, Wiley-Blackwell, 2009

- 0.600 mol of a compound has a mass of 244.6 g.

Calculate (to 3 sf) the number of moles of the same compound equivalent to a mass of 182.3 g.**Check**the**ONE answer**that is**TRUE:**

(Click here for the Video Answer)- 0.224 mol
- 0.447 mol
- 0.805 mol
- None of the above

- A distance of 0.346 miles is equivalent to 0.557 km. Calculate the distance in miles equivalent to 0.430 km.
**Check**the**ONE answer**that is**TRUE:**

(Click here for the Video Answer)- 0.448 miles
- 0.267 miles
- 0.224 miles
- None of the above

- The calculation of the number of moles,
*n*, of a compound produces the following equation:

**Check ALL**of the following**rearrangements**of the equation that would be**correct**and then click '**Confirm Answer**' below:

(Click here for the Video Answer) - If, according to Beer’s law, the absorbance,
*A*, of a solution is proportional to its concentration,*C*, and*A*= 0.65 when*C*= 1.38×10^{-3}g L^{-1}, calculate (to 3 sf) the value of*C*if*A*= 0.43.**Check**the**ONE answer**that is**TRUE:**

(Click here for the Video Answer)- 9.13×10
^{-3}g L^{-1} - 2.09×10
^{-3}g L^{-1} - 1.10×10
^{-3}g L^{-1} - None of the above

- 9.13×10
- If
*A*is directly proportional to*C*and*A*=*A*_{1}when*C*=*C*_{1}, and*A*=*A*_{2}when*C*=*C*_{2},**check ALL**of the following**equations**that are**correct**and then click '**Confirm Answer**' below:

(Click here for the Video Answer)