treasa

Most popular questions and responses by treasa
  1. chemistry

    A sample of gas (1.9 mol) is in a flask at 21 °C and 697 mm Hg. The flask is opened and more gas is added to the flask. The new pressure is 795 mm Hg and the temperature is now 26 °C. There are now __________ mol of gas in the flask.

    asked on June 10, 2014
  2. chemistry

    1)Thallium (I) is oxidized by cerium (IV) as follows: Tl+ + 2 Ce+4  Tl+3 + 2 Ce+3 The elementary steps, in the presence of Mn(II), are as follows: Step 1 Ce+4 + Mn+2 --- Ce+3 + Mn+ Step 2 Ce+4 + Mn+3 ---- Ce+3 + Mn+4 Step 3 Tl+ + Mn+4 ----- Tl+3 + Mn+2

    asked on March 22, 2015
  3. chemistry

    Calculate the volume of fuel needed for a flight if the jet fuel has a density of 0.803kg/L.First use dimensional analysis to convert liter to grams.Then substract to find how many kilograms need to be added.then convert this mass into liters,This is a

    asked on September 9, 2014
  4. chemistry

    . A 0.428-gram sample of a mixture of the solids, KCl and KClO3, is heated. If 80.7 mL of oxygen gas is collected over water at 18.0 oC and 100.8 kPa, calculate the mass percentage of KClO3 in the mixture. (PH2O at 18.0 oC = 15.5 torr

    asked on April 28, 2014
  5. chemistry

    What is the energy released when steam at 25 g of steam at 10 degree celcius is cooled to ice at-10 degree celcius work heat change for the following changes calculated 150 degree Celsius steam --150 degree water 150 degree water to 0 degree water 100

    asked on May 11, 2014
  6. chemistry

    8.10 g metal combines with 7.20g of oxygen to form X2O3. What is the relativ e mass of X

    asked on October 4, 2014
  7. chemistry

    you wish to combine two samples, one sample contains is solid water at 0 degree celsius.The other sample contains liquid water at 0 degree celsius,you want to combine both raise the temperature to 100 degree celcius but boil off only 50 ml to gas phase

    asked on May 30, 2014
  8. chemistry

    you wish to combine two samples, one sample contains is solid water at 0 degree celsius.The other sample contains liquid water at 100 degree celsius,you want to combine both raise the temperature to 100 but boil off only 50 ml to gas phase keep the rest as

    asked on May 29, 2014
  9. chemistry

    A restaurant serves tea in aluminum mugs. The aluminum mug has a mass of 125 g, initially at 24.0 oC with 341 mL tea at 80.0oC. What is the final temperature of the tea after the tea and mug attain equilibrium. Assume the tea has the same specific heat

    asked on March 16, 2015
  10. chemistry

    Calculate the volume of fuel needed for a flight if the jet fuel has a density of 0.803kg/L.First use dimensional analysis to convert liter to grams.Then substract to find how many kilograms need to be added.then convert this mass into liters

    asked on September 9, 2014
  11. chemistry

    Energy must be transferred into or out of a system in order to cause phase change.In addition changes in the energy can be directly related to pressure volume changes.If equal moles of each gas is compressed which one would have the largest pressure volume

    asked on October 21, 2017
  12. chemistry

    you wish to combine two samples, one sample contains is solid water at 0 degree celsius.The other sample contains liquid water at 100 degree celsius,you want to combine both raise the temperature to 100 but boil off only 50 ml to gas phase keep the rest as

    asked on May 30, 2014
  13. chemistry

    A disc of wax has several hot metal sampes placed on it. The samples are of diffrent metals. They are all at the same temperature and have the same mass and contact area with the wax. How will the heat capacity of each metal sample afect the rate at which

    asked on May 14, 2014
  14. chemistry

    what is the final temperature of amixture containning 25 grams of ice at -20 degree celciusadded to water at room temperature 22oC mass of water is 50g followed the steps given by you but not getting the answer (0degree celsius) ice at -20 to ice at 0

    asked on May 12, 2014
  15. chemistry

    What is the final temperature when 54g ice at 0oC is mixed with 200g water at 65oC

    asked on May 8, 2014
  16. chemistry

    Why people feel thirsty after eating salty foods. explain in terms of colligative property

    asked on March 8, 2015
  17. chemistry

    you wish to combine two samples, one sample contains is solid water at 0 degree celsius.The other sample contains liquid water at 100 degree celsius,you want to combine both raise the temperature to 100 but boil off only 50 ml to gas phase keep the rest as

    asked on May 30, 2014
  18. chemistry

    what is the final temperature of amixture containning 25 grams of ice at -20 degree celciusadded to water at room temperature 22oC mass of water is 50g followed the steps given by you but not getting the answer (0degree celsius) ice at -20 to ice at 0

    asked on May 12, 2014
  19. chemistry

    what is the final temperature of amixture containning 25 grams of ice at -20 degree celciusadded to water at room temperature 22oC mass of water is 50g followed the steps given by you but not getting the answer (0degree celsius)

    asked on May 12, 2014
  20. chemistry

    Energy must be transferred into or out of a system in order to cause phase change.In addition changes in the energy can be directly related to pressure volume changes.If equal moles of each gas is compressed which one would have the largest pressure volume

    asked on October 21, 2017
  21. chemistry

    Energy must be transferred into or out of a system in order to cause phase change.In addition changes in the energy can be directly related to pressure volume changes.If equal moles of each gas is compressed which one would have the largest pressure volume

    asked on October 21, 2017
  22. chemistry

    what is the final temperature of amixture containning 25 grams of ice at -20 degree celciusadded to water at room temperature 22oC mass of water is 50g

    asked on May 8, 2014
  23. maths

    are all concurrent lines are intersecting lines?

    asked on July 13, 2017
  24. chemistry

    230Th+He____223Po+2 2H+----- please complete this equation

    asked on September 27, 2014
  25. chemistry

    If it costs $3.92 for a gallon of gas, and I fill up with 13.5 gallons once each 1.5 weeks, how much am I spending on gas in a 5 week month?

    asked on September 14, 2014
  26. chemistry

    What is the Ka of a weak acid (HA) that produces a pH of 3.45 with 0.1M? 2.54E-3 3.45E-3 1.27E-6 3.56E-3 5.48E-4

    asked on June 10, 2014
  1. Chemistry

    Molarity=moles/volume in liters 2.5moldm^-3=moles/0.500dm^3 moles=2.5x0.500=1.25 moles

    posted on October 21, 2017
  2. chemistry

    i don't understand can you make it clear

    posted on May 12, 2014