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A piece of chocolate cake contains about 400 Calories. A nutritional Calorie is equal to 1000 calories (thermochemical calories), which is equal to 4.184 kJ. How many 7-inch-high steps must a 120 pound man climb to expend the 400 Cal from the piece of cake? Assume that the energy used to climb steps is the same as the energy required to lift a mass against the force of gravity, namely: PE = mgh, where m is the mass of the object lifted in kilograms, g is the gravitational constant (9.8 m/s2), and h is the height the object is lifted in meters.
a large weather balloon filled with helium as a volume of 7.00 x 102 l at stp. which expression should be used to find
The volume of the gas collected is 500 ml. What mass of oxygen is collected. The vapor pressure of water at 25 degree celsius is 23.8 torr
How many grams of KO2 are needed to react completely with 7.328 g of CO2.
A voltaic cell consists of a standard H2 electrode in one half-cell and a Cu/Cu2+ half-cell. Calculate [Cu2+] when Ecell is 0.25 V
Carbon and silicon belong to the same group and are known to have similar properties. Do you think that silicon can replace the role that carbon
For the titration of 87.95 mL of 0.1311 M NaOH with 1.2586 M HBr, find the pH equivalence point (ve) in mL of the solution within the receiving flask when 0 mL of HBr is added.
Calculate the rms (average) speed of ClO2 atoms or molecules at 297 oC. Use R = 8.314 kg-m2/K-s2-mol for the value of the gas constant.
an unknown gas has a density of 1.60 g/L at 1.00 atm and 30.5 degrees celsius what is the molar mass of the gas.
Calculate the mass (in mg) of KCN needed to make 500. mL of aqueous KCN solution with a pH of 10.00.
What volume of water should be added to 600 mL of ethanol in order to have a solution that boils at 95 degrees Celsius? (For ethanol, Tb=78.4 degrees Celsius, Kb=1.22 degrees Celsius and d= 0.789 g/ml. For water d= 1.00 g/m
In the conversion of glucose to pyruvate, how many of the actual steps involve electron transfer
Honda procduces a hybird electric car called the honda insight has a gas powered engine and a electric motor and a EPA of 70 mile gallon highway. WHat is the inside ratings of kilometers
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