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an unknown metal reacts with sulfur to form an unknown compound M2S3. if 3.12(grams) of M reacts with 2.88(grams)of S, what is the name of the name of M and M2S3
question a student dissolves some ammonium nitrate nh4no3 in water notices that the beaker gets cooler as the solid
Use the Born-Haber cycle outlined in Section 9.3 for LiF to calculate the lattice energy of NaCl. (The heat of sublimation of Na is 108 kJ/mol and ?Hof = -411 kJ/mol
When a 0.550g sample of olive oil is burned in a calorimeter, the heat released increases the temperature of 370g of water from 22.7C to 38.9C? What is the energy value of the olive oil in kJ/g and kcal/g?
in a test tube containing a precipitate of pboh2 in water will the ions from the salt have a reasonable concentration?
how many mols of o2 are produced by the reaction of 156g of co2 with an excess of ko2
hydrochloric acid reacts with aluminum to form aluminum chloride and gseous hydrogen. whats the mass of aluminum
A helium-filled balloon has a volume of 2.75 L at 17 C. The volume of the balloon decreases to 2.36 L after it is placed outside on a cold day. What is the outside temperature in K?
the solubility of lead (ii) iodide (PbI2) is 0.64 g/L at 20 C. What is the solubility product for lead (II) iodide? Show work please
If the average speed of an oxygen molecule is 4.05multiplied by 104 cm/s at 25°C, what is the average speed of a CO2 molecule at the same temperature?
Phosphate systems form essential buffers in organisms. Calculate the pH of a buffer made by dissolving 0.80mol of NaOH in 0.50L of 1.0M H3PO4.
Find the molar solubility of BaCrO(4) exp (ksp=2.1 X 10(-10 EXP) in (a) pure water and (b) 1.5 X 10(-3 exp) M Na2CrO4.
you need to prepare 100.0 ml of a ph4.00 buffer solution using 0.100 m benzoic acid pka 4.20 and 0.140 m sodium
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