When using a serological pipet, the correct volume is dispensed by.

(A) emptying the contents of the pipet completely into the desired container.
(B) emptying the contents of the pipet until the liquid reaches the 0 mL mark.
(C) emptying the contents of the pipet until the liquid reaches the 10 mL mark.
(D) emptying the contents of the pipet until the liquid reaches the last volume graduation.

i need mutiple choices

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

24