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Suppose a student returned some unused lead nitrate to the container marked"sodium nitrate". What could the student do to get all the led ions out from the sodium nitrate?
Laboratory-grade diethyl ether contains small amounts of ethanol (1-2%). Is this grade of solvent suitable for the preparation
How much heat is needed to warm 45.6 grams water from 23.0° C to 40.0 °C?
Calculate the molar mass and the molecular formula of the solid. (Ki for diphenl is 8.00'C/m)
An aqueous solution of unoxygenated hemoglobin containing 5 g of protein (M= 64000 g/mol) in the 100cm3 of solution is placed in an insulated vessel.
Calcium in a mineral was analyzed five times by each of two methods. Are the mean values significantly different at the 95% confidence level? Method1: 0.0271 0.0282 0.0279 0.0271 0.0275 Method2: 0.0271 0.0268 0.0263 0.0274 0.0269 Chemistry
Calculate the molar concentration of NaNO3 and the mass percent of NaNO3 in the solution. What is the mole fraction of NaNO3 in the solution?
A 51-kg person drinks 390. g of milk, which has a "caloric" value of approximately 3.0 kJ g-1. If only 16% of the energy in milk is converted to mechanical work, how high (in meters) can the person climb based on this energy intake?
sample melts before you were ready to read the temperature. Should you cool the capillary and start again or prepare a fresh sample? Explain.
Suppose one wated to take another approach where C is heated until 5% of the atoms occupy the electronically excited state. Consedering only the lowest-energy ground state and the elctronically excited state
when 7.00 moles of gas A and 3.00 moles of gas B are combined, the total pressure exerted by the gas mixture is 1.0 atm. What is the partial pressure exerted by gas a in this mixture
Given that the solubility of a compound X is 0.60 g/100 mL in ether and 0.12 g/100 mL in water. (a) What is the amount of X in mg that is extracted from a solution containing 60 mg of X in 60 mL of water
Consider the reaction 2 Al2O3(s) → 4 Al(s) + 3 O2(g). ?H = +3339.6 kJ/mol What is ?H for the formation of one mole of Al2O3(s) from the elements
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