HCl + NH3 ---> NH4Cl

Calculate the molar enthalpy of the reaction in terms of kJ per mol of NH4Cl

Can you tell me why in some experiments (such as biodiesel production) do we need to test the cloud point and pour point? What is the purpose?

For the exothermic reaction
PCl3(g)+Cl2(g)⇌PCl5(g)

Kp = 0.160 at a certain temperature.
A flask is charged with 0.500 atm PCl3 , 0.500 atm Cl2, and 0.300 atm PCl5 at this temperature.

What are the equilibrium partial pressures of PCl3, Cl2, and PCl5?

How will the following changes affect the mole fraction of chlorine gas, X Cl2, in the equilibrium mixture.

X Cl2 increases when __________
X Cl2 decreases when _________
X Cl2 stays the same __________

Fill in the blanks above using:
"increase the temperature"
"decrease the temperature"
"decrease the volume of the container"
"increase the volume of the container"

Determinar la molaridad de una solución que contiene 60 g. de NaOH en 500 ml. de solución

what distills first in the 3 types of chromatography? Like do polar or non polar molecules go through first in Simple, fractional, and gas chromatography and what type of solvents (polar or nonpolar) are best for each type of chromatography? thanks

Ammonia is produced industrially from the reaction of hydrogen with nitrogen under pressure in a sealed reactor. What is the percent decrease in pressure of a sealed reaction vessel during the reaction between 3.60 x 10^3 moles of H2 and 1.20 x 10^3 moles of N2 if half of the N2 is consumed? The correct answer is 25%.

Burning sulfur-containing coal results in the redox reactions below:

HgS + O2 ----> Hg + SO2

Hg + O2 ----> HgO

Explain why burning coal may involve redox reaction?

The data below was obtained for titration of 25.00mL of a weak acid with 0.150 M KOH. What volume of the KOH solution is required to reach the stoichiometric point? Answer: __ __ . __ mL

V_KOH added (mL)     pH

0.00                         1.96

2.00                         2.22

4.00                         2.46

7.00                         2.77

10.00                       3.06

12.00                       3.29

14.00                       3.60

16.00                       4.26

17.00                       11.08

18.00                       11.67

20.00                       12.05

25.00                       12.40

What are differences in effects for a chemical and physical interference in an atomic emission spectrometry? (Explain??)

Which of these polymers is NOT formed by a condensation reaction? Explain why.

A. polyester

B. polyethylene

C. nylon

D. polyamide

E. All of the above are formed by a condensation reaction.

A biochemical engineer isolates a bacterial gene fragment and dissolves a 17.0 mg sample of the material in enough water to make 38.9 mL of solution. The osmotic pressure of the solution is 0.340 torr at 25

13. A 15.0 mL NaOH solution is required to neutralize 10.0 mL of 0.100 M H2SO4(aq) solution.   

     What is the concentration of NaOH solution used?  

2NaOH (aq) + H2SO4(aq) → Na2SO4(aq) + 2H2O(l)

Answer the reason why the cellulose is resistance to chemical attack. ( i.e. chemical structure bonding and so on )