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A chemist measures the amount of hydrogen gas produced during an experiment. He finds that 49.4 g of hydrogen gas is produced. Calculate the number of moles of hydrogen gas produced.
Be sure your answer has the correct number of significant digits.
if 76g of Cr2O3 and 27 g of al completely react to form 51 g of Al2O3 how many grams of Cr are formed?
1. A corrosion technologist pipetted a 100.00 mL hard water sample and titrated it with 37.64 mL of 0.01 M EDTA solution for a total hardness endpoint, and 29.32 mL of 0.01 M EDTA solution for a calcium endpoint.
a compound is 40.0c 6.70h and 53.3o by mass. assume that we have a 100.g sample of this compound. what are the
Two different gases occupy the two bulbs shown here. Consider the process that occurs when the stopcock is opened, assuming the gases behave ideally. Draw the final (equilibrium) state. Predict the signs of ?H and ?S for the process.
Consider the reaction at 25C 2NO2 --> 2NO + O2 The overall rxn rate = k[NO2]2. The rate constant, k = 1.4 × 10^10 M-1 s-1. If 3.8 moles of NO2 are initially present in a sealed 1.00 liter vessel at 25 C, what is the half-life of the reaction
sample of gas occupies 10.0-mL at 294.5 K and 1.10 atm. Upon further analysis, the compound is found to be 13.068% C and 86.932% Br. What is the molecular formula of the compound?
A radioactive element has a half-life of 2.2 hours. How many hours will it take for the number of atoms present to decay to one-sixteenth of the initial value? Show your calculations please.
A stock solution is prepared by adding 35 mL of 1.5 M NaNO2 to enough water to make 49 mL. How many moles of NO2- are in 30 mL of the stock solution
an unknown salt is either naf nacl or naocl.when 0.050 mol of the salt is dissolved in water for form 0.500 l of
Calculate the pH of the solution at that point. (d) Calculate the pH of the solution after 20.0 ml of NaOH are added. (e) How many milliliters of NaOH are needed to reach the second equivalence point? Calculate the pH of the solution at that point..
Arrange the molecules in order of decreasing boiling point Molecules are methane, dimethyl ether
How much heat is needed to convert 923 g of ice at -30°C to steam at 119°C. (The specific heats of ice, steam, and liquid are 2.03 J/g · °C, 1.99 J/g · °C, and 4.18 J/g·°C, respectively. The heat of fusion is 6.02 kJ/mol and heat of vaporization i..
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