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Calculate the heat given off when 177 g of copper cools from 155.0 Celsius to 23.0 Celsius. The specific heat capacity of copper is .385 J/g C.
Treatment of X with ozone follwed by zinc in aqueous acid gives a ketone plus formaldehyde (CH2=O). What is the structure of X?
How many molecules of carbon dioxide are produced when 132 molecules of acetylene (HCCH) to react in excess oxygen produce carbon dioxide and water?
Draw the Lewis structures and determine which of these molecules has a central atom that violates the octet rule. Please note that NO3 has an odd number of electrons.
If, in a certain experiment, over a specific time period, 0.0039 mol PH3 is consumed in a 1.8-L container each second of reaction, what are the rates of production of P4 and H2 in this experiment?
If the inert gas Argon gas in a steel cylinder is at a pressure of 9732.0 mmHg, what is the pressure of the argon gas in each of the following pressure units?:
C2H4(g) + O2(g) CO2(g) + H2O(g) How many moles of O2 would be required to react with 0.410 moles of C2H4 in the above unbalanced reaction?
A 4.78g sample of aluminum completely reacts with oxygen to form 6.67g of aluminum oxide. What is the mass percent composition of aluminum in aluminum oxide?
A solution of ammonia and water contains 3.20×1025 water molecules and 8.10×1024 ammonia molecules. How many total hydrogen atoms are in this solution?
How many moles of potassium chloride are produced from 119 g of potassium bromide? how many grams of potassium chloride can be produced from 300. g each of cl2 and KBr?
What is the percent yield of a reaction in which 266 g phosphorus trichloride reacts with excess water to form 134 g HCl and aqueous phosphorus acid (H3PO3)
If 1.60 mol of CS2 burns with 5.60 mol of O2, how many moles of the excess reactant will still be present when the reaction is over?
The partial pressure of O2 in air at sea level is 0.21 atm. Using Henry's law, calculate the molar concentration of O2 in the surface water of a mountain lake saturated with air at 20C and an atmos
When separated from a water solution,CuSO4 forms a hydrate with 5 water molecules per formula unit. If 45 g of anhydrous CuSO4 are dissolved in water, what mass of the hydrate could be recovered fro
A solution is prepared by dissolving 197 g sucrose (C12H22O11) in enough water to produce 1.20 L solution. What is the molarity of this solution?
A student was given 45 mL of ethanol. It has a density of o.789 g/mL. This amount of ethanol was placed into 969 mL of water to make a solution. What is the mass percent of ethanol in water?
basketball with a volume of 3.50 Liters is left in a car when the temperature is 298 K. What will the volume of the ball be as the car heats up to 305 K during the day?
C2H4(g) + O2(g) CO2(g) + H2O(g). How many moles of O2 would be required to react with 0.640 moles of C2H4 in the above unbalanced reaction?
What is the percent yield of a reaction in which 248 g phosphorus trichloride reacts with excess water to form 126 g HCl and aqueous phosphorus acid (H3PO3)?
If 69.5 kJ of heat is applied to a 1034 g block of metal, the temperature of the metal increases by 11.4°C. Calculate the specific heat capacity of the metal in J/g°C.
Calculate the equilibrium concentrations of H2O, CO2, and H2 in a reaction mixture obtained by heating 6.00 of steam and an excess of solid carbon in a 4.25 container.
An equilibrium mixture of O2, SO2, and SO3 contains equal concentration of SO2 and SO3. Calculate the concentration of O2 if Kc =280 for the reaction.
A solution is prepared by dissolving 285 g of sucrose (C12H22O11) in 624 g of water. What is the vapor pressure of this solution at 30°C? (The vapor pressure of water is 31.8 mmHg at 30°C.)
A mixture of 0.0319 g hydrogen and 0.0178 mol oxygen in a closed container is sparked to initiate a reaction. How many grams of water can form?
How many milliliters of the commercial acid does the chemist require to make up a 1.5 liter solution of the dilute acid?