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A 11.3 mL sample of CH3OH (d = 0.793 g/mL) is dissolved in enough water to produce 75.0 mL of a solution with a density of 0.980 g/mL. What is the solution

concentration expressed as ; (a) molarity of CH3OH; (b) molality of CH3OH?
The electronic configuration of two elements X and Y are given below.
X – [Ar]4s2
Y- [Ne]3s2
3p5
.The formula of ionic compound formed is.
A solution containing 0.100 M HF also contains 0.0100 M Ca(NO3)2. Hydrochloric acid is added slowly till the solution has a pH of 2.00. Will a precipitate of calcium fluoride,CaF2 occur? for the HF, Ka=6.46 x 10^-4 and for the CaF2, Ksp=2.69 x10^-11
Consider the following equation. HCl (aq) + NaOH (aq) à H2O (l) + NaCl (aq)
If 0.25 moles of sodium hydroxide completely react with hydrochloric acid how many moles of water will be made?
Calcium sulfate dihydrate, also known as gypsum, is produce when sulfuric acids reacts with calcium carbonate. A limestoon found in the mountaon of magnolia contains 94% CaCO3, 5% MgCO3 and the rest are unreactive spieces called lacrima. Determine of the amount of gypsum produced weight of sulfuric acid sufuric acid used, and the amount of gas formed if 4,500kg of limestone completely reacts with sulfuric acid
2. You spill some sugar in a sandbox. You scoop it up as best you can, but now you have a mixture of sand and sugar. How could you separate the two?
The thermite reaction is very exothermic, the heat of the reaction sufficient to melt the iron that is produced by the reaction:

2Al + Fe2O3 Al2O3 + 2Fe H=?

a) calculate the standard enthalpy change for this reaction?
b) if 40.0 g of iron (III) oxide we’re reacted with excess aluminum, how much heat would be produced ?
c) of the heat produced was used to heat 2.00L of water at 23.0C, what would the final temperature of the water be?
burning methan releases 890.4kj/mol-1 of methane burned in a hot water tank, natural gas is burned to release heat and warm up the water. what mass of methane would need to be burned to warm up 60.0 us gallons of water from 12.0c to 75.0 c?
The thermite reaction is very exothermic, the heat of the reaction sufficient to melt the iron that is produced by the reaction:

2Al + Fe2O3 Al2O3 + 2Fe H=?

a) calculate the standard enthalpy change for this reaction?
b) if 40.0 g of iron (III) oxide we’re reacted with excess aluminum, how much heat would be produced ?
c) of the heat produced was used to heat 2.00L of water at 23.0C, what would the final temperature of the water be?
A calorimeter is used to try To determine the enthalpy of combustion of a candle. The calorimeter contains 7.50 x 10^2 mL of water. The initial mass of the candle is 42.3g and the initial temperature of the water is 18.1 C. After being allowed to burn for a period of time, the candle is re-measured to have a mass of 38.8g and the temperature of the water is 55.6C.
a) how much heat energy was transferred into the water ?
b) how much energy was transferred per gram of paraffin wax?
c) How much energy was transferred per mile of paraffin wax?
d) If the theoretical enthalpy of combustion of paraffin wax is -42kj/g, what is the percentage difference ?
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