Melting point- the temperature at which a substance has changed from a solid to a liquid
freezing- the temperature at which a substance chanes from liquid to a solid
boiling point- the temperature at which a substance changes from a liquid to a gas phase
Answer:
n = 0.271 moles
Explanation:
Given that,
Volume of container, V = 14 L
Pressure of Nitrogen gas, P = 375 torr
Temperature. T = 37°C=37+273=310°C
We need to find the number of moles of nitrogen in the container. Using gas equation,
PV = nRT
R is gas constant, R = 0.082 L-atm/mol-K
Since, 1 atm=760 torr
375 torr = 0.493 atm
Now,
So, there are 0.271 moles of Nitrogen in the container.
Answer:
C.3
Explanation:
The coefficient is the number of molecules needed for a set of reactions. The different reactions will have a different coefficient, so you have to balance the reaction first by knowing all the reactants and the product the reaction. The balanced reaction for sulfuric acid and aluminum hydroxide is:
2 Al(OH)3(s) + 3 H2SO4(aq) -----> Al2 (SO4)3(aq) + 6 H2O(l)
Every set of reactions will need 3 molecules of sulfuric acid and 2 molecules of aluminum hydroxide. The coefficient in front of sulfuric acid (H2SO4) is 3.