April was given 4 liquid substances to identify based on their densities. She measured the mass and volume of each substance and recorded her data in the table on the left. The data table on the right provides a list of known densities for common substances to compare.

April's Data
Known Densities
Substance Mass (g) Volume (mL)
Substance 1 5.00 5.00
Substance 2 680. 5.00
Substance 3 3.95 5.00
Substance 4 24.7 5.00
Substance Density (g/mL)
Mercury 136
Iodine 4.93
Water 1.00
Ethanol 0.789

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

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

the answer is c i took the test