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The density of an unknown metal is 8.94g/cm^3 and its atomic radius is 0.126nm . It has a face-centered cubic lattice.
Predict whether a precipitate of MgF2 will form when 100.0 mls of 3.00 x 10-3 molar Mg(NO3)2 solution is mixed with 200.0 mls of a 2.00 x 10-3 molar NaF solution at 18C.
To identify a diatomic gas (X2) a researcher carried out the following experiement: She weiged an empty 1.00L bulb then filled it with the gas at 1.10 atm and 23.0 celcius and weighed it again. the
What is the volume of a sample of helium that has a mass of 6.36 × 10-3 g, and a density of 0.17847 g/L? Answer in units of mL
Calculate the number of moles in each of the following quantities. atoms of each element in 3.35 moles of aspirin(C9H8O4)
If a 180 mg piece of gold (density =19.32 ) is hammered into a sheet measuring 2.41.0, what is the average thickness of the sheet in meters?
Thomas poured 25 mL of 0.60 M HCl into a large bottle. He then added enough water so that the new (diluted) concentration was 0.10 M HCl. How much water did Thomas add?
Given that the specific heat capacities of ice and steam are 2.06 J/g°C and 2.03 J/g°C, the molar heats of fusion and vaporization for water are 6.02 kJ/mol and 40.6 kJ/mol, respectively, an
A 25ml sample taken from saturated solution of Ca(OH)2 required 36.0ml of 0.100M HCl to titrate. Calculate the concentration (mol/L) of hydroxide ions in the original sample.
What is the density of a block of marble that occupies 350 cm3 and has a mass of 660 g?
If a raindrop weighs 60. mg on average and 5.1 105 raindrops fall on a lawn every minute, what mass (in kg) of rain falls on the lawn in 2.6 h?
A 0.0490 molal aqueous NaBr solution freezes at -0.173°C. What is its apparent percent dissociation in this solution? Kf = 1.86°C/m for water.
A solution of ethanol (C2H5OH) in water is prepared by dissolving 60.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 235.0 mL of solution. What is the molarity of the ethanol in this
A hot tub is filled with 460 gallons of water, which has a density of 1.0 . What is the volume of water in the tub, in liters? What is the mass, in kilograms, of water it contains?How many kilocalor
A 55.0- mL sample of this glucose solution was diluted to 0.500. How many grams of glucose are in 100. of the final solution?
Some ice cubes at 0 degrees C with a total mass of 379g are placed in a microwave oven and subjected to 750. W (750. J/s)of energy for 5.00 minutes. (Assume all energy of the microwave is absorbed b
Positron cannot penetrate matter more than a few atomic diameters, but positron emission of radiotracers can be monitored in medical diagnosis. Explain.
How do you calculate the molar enthalpy of barium nitrate in this situation: potassium nitrate a researcher adds a 261 g sample of barium nitrate to 2.0 L of potassium sulfate solution in a calorimete
The molar heat of combustion of methanol, CH3OH, is -757kJ/mol. If 2g of methanol is placed in bomb calorimeter with heat capacity of 6.5 kJ/c, what is the temperature rise when the sample is combus
calculate the minimum number of grams of propane,C3H8 , that must be combusted to provide the energy necessary to convert 5.00 kg of ice at -15.5 degrees Celsius to liquid water at 78.0 degrees Cels
The standard enthalpy change for the following reaction is 104 kJ at 298 K. C3H8 (g) 3 C(s,graphite) + 4 H2(g) ΔH° = 104 kJ What is the standard enthalpy change for the reaction 3 C(s,grap
What is the vapor pressure (in {rm mm Hg}) of a solution of 15.5g of glucose in 82.0g of methanol at 27 degrees C? The vapor pressure of pure methanol at 27 degrees C is 140 mm Hg.
A 0.456 gram sample of an unknown monoprotic acid (let's call it HZ) was dissolved in some water (you pick the amount). Then the acidic solution was titrated to the equivalence point with 32.5 mL o
At equilibrium the density of the gas mixture is 0.525 g/L at 0.755atm. calculate Kc for the reaction?
Consider the unbalanced equation above. How many grams of O2 are required to react with 13.0 g of C2H6? What mass of CO2 is produced?