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1. A 19 mL sample of a solution of Li2S was diluted with water to 81 mL. A 25 mL sample of the dilute solution was found to contain 0.9 M Li+. What was the concentration of Li2S in the original undiluted solution?
2. What is being calculated when the volume of the solution in liters is multiplied by the molarity of a solute in a solution?
The moles of solute in the solution
The moles of solution
The milliliters of volume in the solution
The molarity of the solute in the solution
The liters of solute in the solution
The volume of the solution in liters
The milliliters of water in the solution
The moles of water in the solution
If 4.50 g of methane gas (CH4) is in a 2.00-L container at 35°C, what is the pressure in the container?
WHich of the following will act as a lewis acid? (please explain why as I need to understand the concept)
An electrochemical cell was constructed from Sn/Sn2+ and Pb/Pb2+ with KNO3 as the salt bridge. The concentrations were Sn2+ =1.0M and Pb2+ = 0.1M.
a solution of ethanol c2h5oh in water is prepared by dissolving 65.8 ml of ethanol density 0.79 gcm3 in enough water
A block of aluminum with a volume of 98.5cm^3 absorbs 68.4J of heat. If its initial temperature was 31.9 degrees celsius, what is its final temperature
Acetylene burns in air according to the following equation. C2H2(g) + 5/2 O2(g) 2 CO2(g) + H2O(g) H0rxn = -1255.8 kJ Given that H0f of CO2(g) = -393.5 kJ/mol and H0f of H2O(g) = -241.8 kJ/mol, what is H0f of C2H2(g)
A two tablet sample of a vitamin/mineral supplement weighting 6.08 g was wet ashed to eliminate organic mattter, complexed with a highly colored ligan and then diluted to 1.00L volume. two 10.00 ml aliquots were then analyzed. calculate the averag..
in the formula sodium phosphate na3po4 how many moles of sodium are represented? how many moles of phosphorus? how many
Water in a glass tube that contains grease or oil residue displays a flat meniscus, whereas water in a clean glass tube displays a concave meniscus. Explain your answer fully.
What mass of CCl2F2 substance must evaporate in order to freeze 109 of water initially at 24 degrees celsius? (The heat of fusion of water is 334 J/g the specific heat of water is 4.18 J/gK .)
Calcium nitrate will react with ammonium chloride at slightly elevated temperature: Ca(NO3)2 (s) + 2 NH4Cl (s) ---> 2 N2O (g) + CaCl2 (s) + 4 H2O (g) A 1.00 mol sample of each reactant will give what volume of dinitrogen monoxide at STP
Compound Z has a solubility limit of 32.5 g/L in diethyl ether. Compund Z has a solubility limit od 2.5 g/L in water. You are given a 100 mL aqueous solution that contains 200 mL of compund Z. If you do three 33.3 mL extractions of Z using diethyl..
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