Other Chemistry Answers

What mass of methane (CH4(g)) needs to be burned to heat 300 mL of water from 23.0 oC to the boiling point (98.0 oC)? (ΔHcombustion = -639 kJ /mol ; specific heat of water = 4.18 J/goC)

(Please note that you must include units throughout all of your calculations and provide your answer in scientific notation to the correct number of significant digits.)

in a reversible reaction equilibrium is obtained when the rate of the reverse reaction is equal to the rate of the reverse reaction to the rate of the forward reaction? is true or false?

A voltaic cell has Cu/Cu2+ and Hg/Hg22+ half cells. E° is +0.34 V for the reaction Cu2+ + 2 e- ⟶ Cu, and E° is +0.79 V for the reaction Hg22+ + 2 e- ⟶ 2 Hg.

A sample of gas at 25°C has a volume of 8 L and exerts a pressure of 690 mm Hg. How many moles of gas are in the sample?

Hello! I am performing an experiment on fruit flies this summer for my science research class and need to create 4 different nicotine concentration solutions to put into the fruit fly media. After reading past articles, I plan on creating 4 solutions with 0.6, 1.8, 3.0 and 4.2 mM. And I plan on having each fruit fly vial be filled with 10 grams of the regular fruit fly media. How would I be able to achieve these concentrations in the vials using pure nicotine powder? If possible please list step to step instructions with the conversions because I want to receive accurate data at the end. If I am missing anything in my request please let me know! Thank you!

One of the methods for synthesizing Methanol (Ch3OH) involves reacting CO with H2. The equilibrium is Co (g) + 2H2 (g) CH3OH (g). At 427°C a mixture of CO, H2 and CH3OH having the following Partial pressures; PCo= 2.0 X 10-3atm, PH2= 1.0X10-6 atm and PCH3OH = 1.0 X 10-6. For this reaction G700K =13.5 Kj. Determine whether the system is at equilibrium

Propane (C3H8) has a normal boiling point of -42.0°C and a heat of Vaporization (Hvapo) of 19.04Kj/mol. What is the Vapor Pressure of propane at 25.0°C?

The molar absorptivity of component A is 3070 at 520nm and 1470 at 600nm. The unknown solution Containing both A and B is analyzed using spectrophotometer in 1.00cm cell. The % T is 54.4% at 520nm and 35% at 600nm. What are the molar concentration of A and B in the unknown?

Potassium-40 decays to argon-40 with a half life of 1.27 x 10^9 yr. What is the age of a rock in which the mass ratio of Argon-40 to potassium-40 is 4.2?

Lewis dot structure of magnesium2 and oxygen7