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Draw the Lewis Structure of the Following species, give the formal charges the central atoms, and state the electrons and molecular geometries of each.
a. HCN b. NO2-c. SeOF2d. IF4+
A toothpaste contains 0.24 by mass sodium fluoride used to prevent dental caries and 0.30 by mass triclosan , a preservative and antigingivitis agent. One tube contains 125 toothpaste.
A 100.0, mL of 10.0 mM phosphate buffer, pH 7.5 (pKa2 = 7.2). You are provided with 0.200 M KOH and 0.100 M KH2PO4 solutions. Calculate volume of KOH and KH2PO4 solutions.
A 10.80-mL sample of sulfuric acid from an automobile battery requires 35.18-mL of 1.62 M sodium hydroxide solution for complete neutralization. What is the molarity of the sulfuric acid? Sulfuric acid contains two acidic hydrogens.
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 following reaction, how many moles of the non-limiting reactant are in excess if 4.4 mol Al are combined with 2.7 mol HCl
c2h42o2 2co2h2o if 2.70 mol c2h4 is reacted with 6.30 mol o2identify the limiting
State which of the following species has the strongest conjugate base and briefly explain your choice. (a) HSO4- (aq)
The calorimeter temperature rises 0.42°C. The calorimeter and water have a combined heat capacity of 32.16 kJ/K. Calculate the heat of formation of ammonia, ?H°f, in kJ/mol. The formation reaction for ammonia is: 0.5N2(g) + 1.5H2(g) ? NH3(g).
A compressed air tank carried by scuba divers has a volume of 9.5 L and a pressure of 130 atm at 20 C. What is the volume of air in the tank (in liters) at STP?
An aliquot (28.7 mL) of a KOH solution required 31.3 mL of 0.118 M HCl for neutralization. What mass (g) of KOH was in the original sample
a 4.78g sample of aluminum completely reacts with oxygen to form 6.67g of aluminum oxide. what is the mass percent
If all 0.44 gigatons CO2 remain in the atmosphere and spread around the atmosphere evenly, what concentration in ppm would it constitute?
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