04/25/20

what is the half-life of this isotope?
24195Am  is used in many home smoke alarms. If 85% of the americium in a smoke detector decays in 1250 years, what is the half-life of this isotope?The correct answer is 4.57 x 102 yr
Follows • 2
Expert Answers •2

04/25/20

What is the metal of this solution
When a solution containing M(NO3)2 of an unknown metal M is electrolyzed, it takes 74.1 s for a current of 2.00 A to to plate out 0.0737 g of the metal. The metal isThe correct answer is Mo
Follows • 2
Expert Answers •1

04/25/20

give the standard line (cell) notation for a voltaic cell built on these half reactions.
Consider the following half-reactions and their standard reduction potentials then give the standard line (cell) notation for a voltaic cell built on these half reactions.Mn2+(aq) + 2 e- <=>... more
Follows • 2
Expert Answers •2

04/25/20

A substance has a ΔHv = 20.0kJ/mol. It has a vapor pressure of 0.800 atm at -2 degrees celsius. What's the normal boiling point?

(Use the Clausius-Clapeyron equation in its two point form) R= 0.08206L·atm/mol·K = 8.314 J/mol·K
Follows • 2
Expert Answers •1

04/24/20

Chemistry and Gas Concepts
P1 is the pressure of Hydrogen gas with water vapor pressure removed using Dalton’s law of partial pressures. What was P1?Mg: 0.040 gRoom Temp: 294 KVapor Pressure of water: 18.7 mm HgBarometric... more
Follows • 2
Expert Answers •1

04/24/20

How much energy is required to raise the temperature of 11.6 grams of solid magnesium from 21.5 C to 37.3 C ?
Follows • 2
Expert Answers •1

04/24/20

percentage of potassium iodide in solution

Question 1 If we mix 2.39g of unknown mixture containing potassium iodide with excess lead(II) nitrate and 1.21g of PbI2 precipitate forms what is the percentage of potassium iodide in the unknown... more
Follows • 2
Expert Answers •1

04/24/20

Jo needs to prepare 500 milliliters of a 2 M solution of (NaOH) in a flask. Which quantity does the laboratory technician need to measure before making the solution?
The flask has a volume of exactly 500 milliliters.A. the mass of the soluteB. the mass of the solventC. the mass of the solutionD. the mass of the flask
Follows • 2
Expert Answers •1

04/24/20

thank you so much for the help:)
   Consider the following reversible reaction: COCl2(g) ⇌ CO(g) + Cl2(g)               What is the equilibrium concentration of Cl2 if the initial concentration of             COCl2 =... more
Follows • 2
Expert Answers •1

04/24/20

13. For the following reaction, Kc = 1.0 × 1012 at 500 K. 2 SO2(g) + O2(g) ⇌ 2 SO3(g). What is the value of Kp for this reaction at the same temperature?

Follows • 2
Expert Answers •1

04/24/20

12. The equilibrium constant for the reaction: 2SO2(g) + O2(g) ⇌ 2SO3(g) is Kc = 1.7 × 106. What is the equilibrium constant for the reaction: SO3(g) ⇌ ½ O2(g) + SO2(g).

Follows • 2
Expert Answers •1

04/24/20

10. The decomposition of cyclopropane has a rate constant of 6.7 x 10-4 s-1. If the initial concentration of cyclopropane is 1.50 M, what is the concentration of cyclopropane after 650 s?

Follows • 2
Expert Answers •1

04/24/20

help please i need and explanation with answers
The reaction, 2 N2O(g) → 2 N2(g) + O2(g), has a rate constant equal to 0.76 s-1 at 1000 K. How long will it take for the concentration of N2O to decrease to 35% of its initial concentration?
Follows • 2
Expert Answers •1

04/24/20

please i need help with this quetions with steps?
1.     The data in the table below is collected for the reaction: CO(g) + Cl2(g) → COCl2(g).  a) Determine the rate law. _______________________________b) Calculate the value of the rate... more
Follows • 2
Expert Answers •1

04/24/20

7. Given the following rate law, how does the rate of reaction change if the concentration of Y is reduced by a factor of three? Rate = k [X] [Y]2

Follows • 2
Expert Answers •1

04/24/20

4. Calculate the freezing point of a solution of 45.0 g of ethylene glycol (C2H6O2) dissolved in 250.0 g of water?
Follows • 2
Expert Answers •1

04/24/20

it is on chemistry
The half-life for the second-order decomposition of HI according to the chemical equation: 2HI (g)  → H2 (g) + I2(g) is 10.5 s when the initial concentration of HI is 0.55 M. What is the rate... more
Follows • 3
Expert Answers •1

04/24/20

Chemistry question
3. Suppose in the lab, 3.68 g of zinc was allowed to react with hydrochloric acid to produce zinc chloride and hydrogen gas. How much zinc chloride should you get? Suppose that you actually... more
Follows • 2
Expert Answers •1

04/24/20

General chemistry

Calculate the molality of a solution that is prepared by mixing 259.5 mL of CH3OH  (d = 0.792 g/mL) and 1387 mL of CH3CH2CH2OH (d = 0.811 g/mL)
Follows • 2
Expert Answers •1

04/24/20

how much oxygen is consumed in equation: C5H12 + 8O2 → 6H2O + 5CO2 when 10.0 grams of the pentane is burned in excess oxygen.
please show your work, this is the reaction when 10.0 grams of propane are burned in 10.0 grams of oxygen
Follows • 2
Expert Answers •1

04/23/20

General chemistry

Commercial grade HCl solutions are typically 39.0% (by mass) HCl in water. Determine the molarity of the HCl, if the solution has a density of 1.20 g/mL.
Follows • 2
Expert Answers •1

04/23/20

This is general chemistry

A solution is prepared by dissolving 318.6 g sucrose (C12H22O11) in 4905 g of water. Determine the molarity of the solution
Follows • 2
Expert Answers •3

04/23/20

Theoretical yield

What is the theoretical yield of H2O (MM=18) produces by burning 150g of C2H6 (MM=30) and enough O2 to allow for complete reaction. If the actual yield of H2O was found to be 135g of H2O, what is... more
Follows • 2
Expert Answers •2

04/23/20

What does a 1.84 mol sample of oxygen gas occupie a volume of ??
Answer should be in L at STP
Follows • 2
Expert Answers •1

04/23/20

0.690 mol sample of oxygen gas at a temperature of 24.0 C is found to occupy a volume of 26.7 liters. What is the pressure of this gas sample in mm hg?
Follows • 2
Expert Answers •1

Still looking for help? Get the right answer, fast.

Ask a question for free

Get a free answer to a quick problem.
Most questions answered within 4 hours.

OR

Find an Online Tutor Now

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.