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What is the percent yield of the reaction if 28.3 g of phosphorus triiodide PI3 is obtained when 68.0 g of I2 and 68.0 g of P are mixed and allowed to react?
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formula unit and model of an ionic solid made up of potassium and sulfur
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What is the final concentration if 75.0 of a 3.50 glucose solution is diluted to a volume of 400.0 ?
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(A) lead(II)nitrate and ammonium carbonate solutions are combined. (b)zinc chloride solution is poured into a solution of magnesium sulfate.(C)Ammonium chloride and nickle(ii)nitrate solutions are combined. (D)Magnesium chloride solution is mixed with lithium phosphate solution.
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What is the molarity of a solution that contains 60.0 of vitamin B1 hydrochloride (molar mass = 337 ) in 180 of solution?
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Identify any incorrect formulas. explain your answer. a. Mg2(SO4)3 b. Rb3As c. BeCl3 d. NaF
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A buffer is made by dissolving h3po4 and nah2po4 in water. write an equation to show how this buffer neutralizes added acid.
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Rank the gas molecules CO2, C2H6, H2O, He, H2 in terms of increasing rate of effusion.
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CH3CH2CH2COOH intermolecular forces
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A chemist wants to prepare 0.21 M HClO4, from a stock solution of HClO4 that is 12.1 M. How many milliters of the stock solution are required to make up 500 mL of 0.21 M HClO4
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Sample Questions
- 1. For organic chemistry, what is a concerted shift? How do things like acids or heat affect them? What other factors affect them?
- 2. Which of the following reactions is an acid-base neutralization reaction? Why are the rest of the answers incorrect?
- A. AgNo3 (aq) + NaI (aq) --> AgI (s) + NaNO3 (aq)
- B. S8(s) + 8O2 (g) --> 8SO2(g)
- C. Na3PO4 (s) + 2H2O (l) --> H2 (g) + 2NaOH (aq)
- D. Ca (OH)2 (aq) + 2HI (aq) --> CaI2(aq) + 2H2O (l)
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