Which sample of water has the lowest vapor pressure?
1.
100 mL at 50°C
2.
200 mL at 30°C
3.
300 mL at 40°C
4.
400 mL at 20°C

400 ml at 20⁰C

Explanation:

VP ∝ Temp => Increasing temperature increases VP or decreasing temperature decreases VP. VP is independent of the quantity of liquid in consideration. Therefore, the sample at the lower temperature would have the lowest VP; i.e., 400-ml at 20⁰C.

each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i  

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.