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Iron is produced by heating iron(III) oxide with carbon (in form of coke) to give iron and carbon dioxide. Calculate the mass of coke needed to react completely with 1kg iron(III) oxide?
if 1lb of fat is stored by the body for each14.6103kj of excess nutritional energy consumed how many bags of chips
At 25°C, 100.0 cal of heat is applied to each of 30.0 g of copper and 50.0 g of aluminum. a) Which metal will absorb the most heat? b) Which will experience the greater change in temperature. c) Calculate the final temperature of each metal. scopp..
A pH of 3.74 is reached when 18.50 mL of sodium hydroxide has been added to the acid solution. What is the molar mass of formic acid given this data?
The sun produces energy via fusion. One of the fusion reactions that occurs in the sun is How much energy in joules is released by the fusion of 3.06 of hydrogen-1
A 247-ln fullback runs the 40-yd dash at a speed of 19.99 +/- 0.10 mi/h and has a wavelength of 7.79E-37. What is the uncertainty in his position based on the de Broglie wavelength
Lithium has two stable isotopes with masses of 6.01512 u and7.01600 u. The average molar mass of Li is 6.941 u. Explain what is the percent abundance of each isotope
The heat of vaporization of water is 40.66 kJ/mol. Assuming sweat is 100% water, how much heat is removed from your body through the evaporation of 3.13 g of sweat?
formaldehyde h2c o is known to all biologists because of its usefulness as a tissue preservative. when pure
The chemist then initiates a reaction in the solution that causes all of the copper to form a precipitate (form a solid) that settles to the bottom of the container. What should be the mass (in grams) of the copper precipitate?
If the activation energy for the isomerization ol cyclopropane to propene is 274 kJ/mol. Explain by what factor does the rate of reaction increase as the temperature increases from 247 to 279 oC. The factor is the ratio of the rates.
calcium malonate, the salt of malonic acid, is found in beetroot and is known as an inhibtor of the citric acid cyle. if a sample of beetroot disolved in water has a pH of 8.20,
If 2.50 g CuSO4 are dissolved in 8.0 x 102 mL of 0.25 M NH3, what are the concentrations of Cu2+, Cu(NH3)42+, and NH3 at equilibrium
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