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A student is preparing a series of calimetry experiments. She first wishes to determine the calorimeter constant Ccal for her coffee cup calorimeter. She pours a 50.0mL sample of water at 345K into the calorimeter containing a 50.0mL sample of water at 298K. She carefully records the final temperature as 317K. Explain what is the value of Ccal for the calorimeter?
An automobile gasoline tank holds 36 kg of gasoline. When the gasoline burns, 95 kg of oxygen is consumed, and carbon dioxide and water are produced.
Rate of reaction for 8H2S +4O2 -> 8H2O + S8, if started with 21.35g of H2S and 15.36g of O2. What is the limiting reactant and how much S8 can be produced?
How many litres of NO are produced at STP when 162 g Ag reacts with excess HNO3
A chemist wanted to make 100 grams of SO2. She had only 12 grams if sulfur and 4 grams of oxygen. Unfortunately, the amounts of reactants were not enough to make the desired product.
How many liters of CO2 are formed at STP by the complete combustion of the propane in a container with a volume of 14.0L and a pressure of 4.5atm at 24?C?
the mass natural abundance of the isotopes h and d are 99.985 and 0.015 respectively. the mass natural abundance of
The pKb values for the dibasic base B are pKb1 = 2.1 and pKb2 = 7.8. Calculate the pH at each of the following points in the titration of 50.0 mL of a 0.75 M B(aq) with 0.75 M HCl(aq).
a sample of nitrogren gas is collected in a 100 mL container at a pressure of 688 mm Hg and a temperature of 565 degrees C. how many grams of nitrogen gas are present in gas sample?
assume that a gold atom is shaped like a sphere. an atom of gold has a radius of 156 pm and a mass of 197 amu.
What mass of CCl2F2 substance must evaporate in order to freeze 109 of water initially at 24 degrees celsius? (The heat of fusion of water is 334 J/g the specific heat of water is 4.18 J/gK .)
What is the temerature in C of gas if the volume is changed to 5.79 L and the pressure is changed to 765 mmHg if the gas originally has a volume of 4.00 L, a temp of 298 K, and pressure of 782 mmHg
A system has four energy levels. The degeneracies of these energy levels are as follows: g0 = 3, g1 = 2, g2 = 1, g3 = 4. For 20 gas molecules, at T = 0 K, how many molecules are in the first excited state
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