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Percent Mass and Stoichiometry1) You are the science officer on the Starship Enterprise. The ship is circling a new planet. The away team comes back with some rocks and minerals. Some of the minerals contain iron and you want to determine the amount of iron in the sample.You take 9.000 g of this mineral and treat it with excess bromine (bromine reacts with iron metal to produce iron(III) bromide, which is soluble in water). The solution containing the iron(III) bromide and bromine is then treated with excess silver nitrate. The mass of the silver bromide obtained is found to be 46.34 g. What is the percent of iron in the mineral sample?
2) A common laboratory experiment for introductory chemistry courses involves the analysis of a mixture of BaCl2 and BaCl2.2H2O. You are given a white powder that is a mixture of these compounds and are asked to determine the weight percent of each.You find that 1.392 g of the mixture has a mass of 1.157 g after heating it to drive offall of the water present.(A) What is the weight percent of water in the mixture?(B) What is the weight percent of BaCl2 in the mixture?(C) What is the weight percent of Ba in the mixture?
3) If a bottle of wine is not kept under appropriate conditions, the ethanol (C2 H5 OH) is oxidized to a limited extent (it turns to acetic acid) and the wine becomes very sour and is no longer drinkable. This can be expressed by the following reaction.C2 H5 OH + O2--> C2 H4 O2 (Unbalanced)If the wine contains 15% by mass ethanol (assume the only other ingredient in the wine is water), how many moles of acetic acid are produced i3s9?liter of this wine.The density of the wine is 1.010 g/mL. Assume that all the ethanol is converted to acetic acid. The molar masses of C, H, and O are 12.011, 1.00794, and 15.9994 g/mole,respectively.
110 mL of H_2O is initially at room temperature (22.0 degrees C). A chilled steel rod at 2.0 degrees C is placed in the water. If the final temperature of the system is 21.0 degrees C.
In the decomposition of hydrogen peroxide, the percentage yield of oxygen is 93%. What is the actual yield in grams of oxygen if you start with 100 grams of H2O2.
The heat of vaporization of water =40.66 kJ/mol at 100 °C. Compute the quantity of heat that is absorbed/released when 9.00 grams of steam condenses to liquid water at the temperature of100 degree celsius.
How many kilograms of methane (CH4) are in perfectly insulated piston with the following properties: Volume = 2 cubic meters.
Making a dilute solution, A student in lab class needs to provide a detailed description of how to make a dilute solution of 500 g
A nitric acid solution containing 71% HNO3 (by mass) has a density of 1.42g/mL. how many moles of HNO3 are present in 1.00L of this solution.
explain in molecular terms, whether evaporation rate of a liquid is constant or varied in the presence of changing ambient air pressure.
An odorous gas emitted by a hot spring was found to diffuse 2.92 times slower than helium. What is the molar mass of the emitted gas.
At its boiling point of -34.0 degree Celsius, 6.33 kJ of heat is required to vaporize 22.0 g of chlorine (Cl2). What is the molar enthalpy of vaporization of chlorine.
Ddetermines how many tablets should be given to her if there are five tablets in stock.
Describe the nature and characteristics of PCB's. Why are they of importance to an EH&S or FS professional who encounters them when coming upon an incident scene where they are present?
Nuclear reactions is expressed in given reaction as 2/1H +2 /1H→3/2He + ? ; 233/92U+1/0n→133/51Sb+98/41Nb+?1/0n
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