Change the unit used to report each of the following measurements by replacing the power of ten by an appropriate SI prefix.

(a) 4.54 10^-3 g

1

4.54 mg 4.54 µg     4.54 ng 4.54 pg

(b) 3.76 10^-12 m

2

3.76 mm 3.76 µm     3.76 nm 3.76 pm

(c) 6.34 10^-6 g

3

6.34 mg 6.34 µg     6.34 ng 6.34 pg

The two naturally occurring isotopes of nitrogen are nitrogen-14, with an atomic mass of 14.003074 u, and nitrogen-15, with an atomic mass of 15.000108 u. What are the percent natural abundances of these isotopes? (Answer to 3 significant figures.)
nitrogen-14

Enter a number.

1%
nitrogen-15

Enter a number.

2%

Lithium hydroxide absorbs carbon dioxide to form lithium carbonate and water.

2 LiOH + CO₂ Li₂CO₃ + H₂O

If a reaction vessel contains 0.180 mol LiOH and 0.089 mol CO₂, which compound is the limiting reactant?
How many moles of Li₂CO₃ can be produced?

Enter a number with the correct number of significant figures.

2 mol

To 125 mL of 1.30 M Na₂CO₃(aq) is added 75 mL of 4.3 M HCl(aq). Then the solution is evaporated to dryness. What mass of NaCl(s) is obtained?

Enter a number with the correct number of significant figures.

1 g NaCl

Carry out the following conversions between pressure units.

(a) 0.850 atm to mmHg

Enter a number with the correct number of significant figures.

1 mmHg
(b) 859 Torr to atm

Enter a number with the correct number of significant figures.

2 atm
(c) 635 Torr to kPa

Enter a number with the correct number of significant figures.

3 kPa
(d) 16.5 lb/in.² to mmHg

Enter a number with the correct number of significant figures.

4 mmHg