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a 1.628 gram sample of a hydrate of magnesium iodide is heated until all of the water is removed. its mass is now 1.072 grams. what is the formula of the hydrate?
A 4.10 g nugget of pure gold absorbed 287 J of heat. The initial temperature was 24.0°C. What was the final temperature?
A 120g sample of an unknown substance was heated from 15oC to 30oC. The substance absorbed 458 joules of energy. What is the specific heat of this substance?
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?
Calculate the quantity of gas, in moles, if 127 L at 55.0 C has a pressure of 11.35 kPa.
Write equations for the reaction of each of the following with (1) Mg in ether followed by (2) additione of D2O to the resulting solution:
A piece of sodium metal reacts completely with water as follows. 2 Na(s) + 2 H2O(l) 2 NaOH(aq) + H2(g) The hydrogen gas generated is collected over water
A 0.5078g sample of impure nitrobenzene was treated with 1.044g of tin. when the reaction was complete, the residual tin was found to weight 0.338g. Calculate the percentage of nitrobenzene in the sample.
A beaker contains 0.964 grams of nitrogen. How many moles of molecular nitrogen does the beaker contain?
A solution, made by dissolving 62.07 g of a nonelectrolyte in 500 g of H2O, exhibits a freezing point of -1.86 °C. Determine the molecular weight of this nonelectrolyte compound? For water Kf = 1.86 °C m-1Kb = 0.51 °C m-1
a main component of photochemical smog. Classify this reaction as a synthesis, decomposition, single-displacement, or double-displacement reaction.
Which of the seven Anions will be the hardest to detect (same anions as above), Why do you think this? If two or more are possible explain why.
A gas occupying 28mL at standard conditions is heated to 18C while the pressure is reduced to 0.98221 atm. What is the new volume occupied by the gas? Answer in units of mL.
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