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High-purity silicon is obtained using a three-step process. The first step involves heating solid silicon dioxide,Sio2 , with solid carbon to give solid silicon and carbon monoxide gas. In the second step, solid silicon is converted into liquid silicon tetrachloride,SiCl4 , by treating it with chlorine gas. In the last step, is SiCl4 treated with hydrogen gas to give ultrapure solid silicon and hydrogen chloride
Calculate the masses of carbon, chlorine, and hydrogen required per kilogram of silicon.
Is heat absorbed or evolved in the course of this reaction? Calculate the amount of heat transferred when 45.0 g of CH3OH (g) is decomposed by this reaction at constant pressure.
Classify the set of solutions based on the movement of solvent from the first solution listed to the second solution listed as osmosis or reverse osmosis.
Draw those that have a trisubstituted ring where the methyl groups are oriented in para. Please draw structures
What volume (in mL) of 0.657 M solution of iron(III) chloride can be made from 52.3 mL of a 1.89 M solution? Assume the volumes are additive.
what is the mass in milligrams of ink in a droplet from this printer? Is ?milligrams? an appropriate unit for describing this mass?
Two 20.0-g ice cubes at -16.0 °C are placed into 275 g of water at 25.0 °C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature of the water after all the ice melts.
The reaction of 2,2-dimethyl-1-propanol with HBr is very slow and gives 2-bromo-2-methyl-propane as the major product
how much must you perspire to maintain a constant body temperature assuming no other energy changes and all the calorie content of the soda is released as heat?
A 32.0-g sample of water at 290. K is mixed with 51.0 g water at 340. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
What mass of oxygen is needed to burn the butane in the lighter completely. How many moles of CO2 form when all of the butane is the lighter burns. How many molecules of gas form when the butane in the lighter burns completely.
A pound of coffee beans yields 40 cups of coffee (4 cups = 1 ). How many milliliters of coffee can be obtained from 1.0 of coffee beans?
3.47 Annual floods for a stream are normally distributed with a mean of 30,000 cfs and a variance of 1 x 106 cfs2. Determine the average return period Tr of a 32,000-cfs flood in the stream.
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