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Five mineral samples of equal mass of calcite, CaCO3 (MM 100.085) , had a total mass of 10.1 ± 0.1 g. What is the average mass of calcium in each sample? (Assume that the relative uncertainties in atomic mass are small compared the uncertainty of the total mass.)
If there are 0.640 g of NaCl left in a beaker that originally contained 75.0 mL of saltwater, what must have been the molar concentration of the original solution? The molar mass of NaCl is 58.44 g/mol.
In a synthesis experiment you obtain a sample of product on which you do a melting point determination and find a melting point range of 108.0 to 114.3 degrees Celsius. The sample is supposed to be benzoic acid.
with what volume of 5.0M HF will 7.4 g of calcium hydroxide react completely, according to the reaction 2HF + Ca(OH)2 --> CaF2 + 2H2O
The X compound decolors in Bromine, bubbles in Na metal, changes from orange to green in Chromic Acid, and has no reaction with Lucas reagents.
Ammonia reacts with oxygen according tot he following equation: 4NH3+5O2=4NO+6H2O deltaHrxn = -906kJ Calculate the heat (in kJ) associated with the complete reaction of 155g of NH3.
If 28.9 grams of trans-2-butene reacts with 14.2 grams of HCl to form 15.5 grams of chlorobutane, what is the percent yield?
Calculate the molar solubility of AgI in 3.6 M NH3. The overall formation constant for Ag(NH3)2+ is 1.7 x 10^7.
What is the density of a substance if a 2.50mL sample has a mass of 0.880g at room temperature? ( show calculations) What is the specific gravity of the substance?
How many grams of NaCl can be produced from the reaction of 1.35g of Na2CO3 with 125mL of 0.265M HCl according to the following reaction
a coffee cup calorimeter containing 100ml of 0.30M HCl at 20.3degrees celcius. when 1.82g of Zn solid is added, the temperature rises to 30.5 degrees celcius. what is the heat of reaction per mole of Zn.
The combustion of 45.0 g of methane (natural gas) releases 2498 kJ of heat energy. How much energy in kilocalories kcal would combustion of 0.670oz of methane release.
Assume that the maximum number of ATP's is produced (38). At pH 7, and in the presence of excess Mg2+
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