PH3(g) 1/4 P4(g) + 3/2 H2(g) is first order in PH3. The initial concentration of PH3 was 0.0542 M, the concentration of PH3 dropped to 0.00851 M after 68.0 s passed. Based on this experiment, the rate constant for the reaction is __s^-1?

the role of the microscope world in creating new materials .

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

the answer is 1260

you spend 7 hours in school for 1 school day with 5 school days in 1 school week with 36 school weeks in a school year.

7*5*36= 1260 it's all about multiplying