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Physical Chemistry
A 12.0g sample of an unknown metal at 80.0 degree C was placed in 50.0g of water at 20.0 degree C. The final temperature of the metal and water was 24.0 degree C. Determine the specific heat of the metal in J/g degree C. (specific heat of water =4.184 J/g degree C)
Physical Chemistry
84.01g of baking soda, NaHCO3, always contains 22.99 g of sodium, 1.01 g of hydrogen, 12.01 g of carbon, and 48.00 g of oxygen. what percentage of each of these elements is present on baking soda?
Physical Chemistry
What is the specific heat of a substance if 19.5 kJ are required to raise the temperature of 205 g of the substance from 56.5°C to 197.0°C?
Physical Chemistry
what is the number of electrons protons and neutrons for the elements of Sodium and Chromium?
What element has 26 electrons? and what are the protons and neutrons for that element?
What element has 26 electrons? and what are the protons and neutrons for that element?
Physical Chemistry
At a height of 312 km above the Earth's surface, an astronaut finds that the atmospheric pressure is about 1.35E-8 mmHg and the temperature is 585 K. How many molecules of gas are there per milliliter at this altitude?
Physical Chemistry
The rate of a particular reaction quadruples when the temperature is increased from 10.°C to 45°C. Calculate the activation energy for this reaction.
Physical Chemistry
A certain reaction has the form aA----> products. At a particular temperature, concnetration vs time data were collected. A plot of 1/[A] vs t (in seconds) gave a straight line with a slope of 6.90* 10^-2. Calculate the rate constant for this reaction.
Physical Chemistry
A reaction of the form aA----> products gives a plot of 1/[A] vs time (in seconds) which is a straight line with a slope of 4.15* 10^-3. Assuming [A]o= 0.100 M, calculate the time (in seconds) required for the reaction to reach 64.6 percent completion.
Physical Chemistry
Substitute natural gas which can be used as a fuel is prepared via the following reaction:
4 CO(g) + 8 H2 (g) 3 CH4 (g) + CO2 (g) + 2H2O(l)
Using the data given below determine ΔHo for the substitute natural gas reaction above.
C (graphite) + ½ O2(g)---------- CO(g) -110.5 kJ
CO(g) + ½ O2(g)------- CO2(g) -283.0 kJ
H2(g) + ½ O2(g)----------- H2O(l) -285.8 kJ
C (graphite) + 2 H2(g)----------CH4(g) -74.81 kJ
CH4(g) + 2 O2(g)---------- CO2(g) + 2 H2O(l) -890.3 kJ
4 CO(g) + 8 H2 (g) 3 CH4 (g) + CO2 (g) + 2H2O(l)
Using the data given below determine ΔHo for the substitute natural gas reaction above.
C (graphite) + ½ O2(g)---------- CO(g) -110.5 kJ
CO(g) + ½ O2(g)------- CO2(g) -283.0 kJ
H2(g) + ½ O2(g)----------- H2O(l) -285.8 kJ
C (graphite) + 2 H2(g)----------CH4(g) -74.81 kJ
CH4(g) + 2 O2(g)---------- CO2(g) + 2 H2O(l) -890.3 kJ
Physical Chemistry
a column of mercury has an inside diameter of 1/2 cm and is 10 ft tall. what is the down ward force in newtons, atmospheres and torr for this column of mercury
