nona

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Questions

The following questions were asked by visitors named nona.

A 200 g ball is lifted upward on a string. It goes from rest to a speed of 2.0 m/s in a distance of 1.0 m. What is the tension in the string?

seawater contains 0.0065% (by mass) of bromine. how many grams of bromine are ther in 1.oo l of seawater? the density of seawater is 1.025 g/ml.

6. A 2.50 L flask was used to collect a 5.65 g sample of propane gas, C3H8. After the sample was collected, the gas pressure was found to be 956 mmHg. What was the temperature of the propane in the flask?

7. Calculate the density of hydrogen sulfide, H2S, at 56 ºC and 967 mmHg. (Express density in g/L)

8. A chemist vaporized a liquid compound and determined its density. If the density of the vapor at 90 ºC and 753 mmHg is 1.585 g/L, what is the molecular weight of the compound?

11. Calculate the total pressure of a mixture of 0.02 mol He and 0.01 mol H2 in a 5.0 L flask at 10 ºC.

14. Calculate the amount of heat liberated (in kJ) from 350 g mercury when it cools from 77.0 oC to 12oC. (The specific heat of mercury is 0.139 J/g oC)

15. How much heat energy (in kJ) is evolved by a reaction in a bomb calorimeter in which the temperature of the bomb and water increased from 19.5 to 22.83 ºC? The bomb has a heat capacity of 650 J/C; the calorimeter contains 320 g of water.

16. From the standard enthalpies of formation, calculate the ƒ´Horxn for the reaction: (ƒ´Hof = -151.9 kJ/mol for C6H12.) C6H12(l) + 9 O2(g) „³ 6 CO2 (g) + 6 H2O(l)

17. Calculate ƒ´H of strontium carbonate using Hess law Sr + C (graphite) + 3/2 O2 ¡÷ SrCO3 Experimental information SrO ¡÷ Sr + 1/2 O2 ƒ´H 592 kJ SrO + CO2 ¡÷ SrCO3 ƒ´H -234 kJ 2 C (graphite) + 2 O2 ¡÷ 2 CO2 ƒ´H -788 kJ .

18. Calculate ƒ´H for the following reaction using Hess law H2 (g) + Br2 (g) ¡÷ 2 HBr (g) Experimental information 2 H+ ¡÷ H2 ƒ´H -436.4 kJ 2 Br- ¡÷ Br2 ƒ´H -192.5 kJ 2 H+ + 2 Br- ¡÷2 HBr ƒ´H -144.8 kJ

What is the energy in joules and wavelength in meters of microwave radiation with  = 2.4 ×1011s-1?

What is the energy and frequency of a photon with a wavelength of 2.57 ×102 m?

A string is 16 METERS LONG. HOW MANY PIECES OF LENGTH 1-METER LONG CAN CUT FROM IT?

Answers

The following answers were posted by visitors named nona.

i have the same truple :( i cant get what they really want !!!

The answer is T = 1.96 + 0.4 = 2.39 N

The work done = Force X displacement in the direction of the force. The sum of forces in the horizontal direction is mgSin(of the angle)- F = 0 The force acting, F = mgSin(of the angle). The Work done by this force = mgSin(of the angle) X 15 meters The Wo...

should you do what you feel is best for jerry at the risk of alienating yourself from the staff?".

7. Calculate the density of hydrogen sulfide, H2S, at 56 ºC and 967 mmHg. (Express density in g/L)

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