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Evaluate the temperature change as a pure liquid which is converted to a solid at its freezing point with the temperature change as a solution is converted to a solid at its freezing?
Determine the approximate molecular weight of this unknown compound which is having the empirical formula of C2 H3Cl2.
When a solution which is having 100ml of an acid, HA and 100ml of the solution of a base, BOH, are mixed in a calorimeter, the heat capacity of the calorimeter is 10.5 J/Co and the temperature
Determine the corresponding volume of this body? A ribbon has the following experimentally determined the dimensions: a length of 2.500000 km, a thickness of 25 micrometers and a width of 2
Determine the concentration of the permanganate solution when adding just one drop beyond 43.47 ml of the permanganate solution to the oxalate solution, the solution turns light purple.
A sample of magnesium metal which is having the 0.0677 g reacted with excess the hydrochloric acid to make the 69.9 ml of hydrogen gas. At 21.0 o C the gas was collected over the water and
A sample of unknown metal, X (s) which is having, formed 71.4 ml of hydrogen gas when they are reacted with the HCl according to the equation: X(s)+ 2 HCl(aq) --> XCl2(aq) + H2(g)
Write down a balanced ionic equation for the reaction. Write down a balanced molecular equation for the reaction.
A closed 5.00L flask which is having the 3g of mercury at the room temp 25 degrees Celsius. Determine the number of degrees should we increase the temp of flask so that the mercury vapor pressure i
If hydrogen is actually further left on the periodic table then explain why would carbon come first in the molecular formula?
Determine the number of moles of water molecules do you have? Determine the number of molecules of water do you have?
Determine the number of grams do 5.10x1024 molecules of P4weigh? Determine the number of molecules of sulphuric acid, H2SO4 are there in 43.0 grams of sulphuric acid?
Determine the mass of NaCl necessary to add to 200mL of water. Suppose the density of water =1.0g/mL to make 1molality solution.
Determine the volume in liters of 0.377 M manganese (II) sulphate that contains the 58.4 g of solute. Determine the volume in milliliters of 6.11*10^-2 M adenosine triphosphate (ATP) that contains
Calculate the molarity of H2SO4 solution if a preparation of sodium carbonate (Na2CO3) is known to contain the 98.6% Na2CO3. When a 0.678 g sample needs 36.8 mL of H2SO4 for complete ne
Calculate the empirical formula of vanillin? Vanillin, the dominant flavoring in vanilla, which contains C, H, and O and 1.05g of this substance, is completely combusted, 0.50g of H2O and 2.43g of
Copper (II) bromide reacts with potassium phosphate to produce Potassium bromide and copper (II) phosphate. Find out the maximum number of moles of copper (II) phosphate that could be formed from 1
An organic compound was found to contain 10.34% hydrogen, 27.59% oxygen and 62.07% carbon. Calculate its empirical formula and suggest a few possible molecular formulas. Name each of them.
A compound was found to have a molar mass of 245.8g and the following composition: 2.44% H, 13.02%O, 19.53% C and 65.01% Br. State the empirical formula and its molecular formula.
A compound was found to have in 11.1% H, 35.6% S and 53.3%C. Calculate its empirical formula and suggest its molecular formula, knowing that it smells like rotten eggs when it becomes moist. Discus
Determine the values of the quantum numbers n, l, ml, s, and ms for each of the valence electrons of a nitrogen atom in the ground state?
Determine the volume of 1.44 M calcium chloride must be diluted with water to prepare the 408.0 mL of a 2.85×10-2 M chloride ion solution?
Estimate the flame temperature produced by the reaction when an oxyacetylene flame is often used in the welding of metals.
The same compounds A and B have different Rf values in a second solvent system: Rf=0.78 for B and Rf=0.81 for A. Which solvent system provides the greater separation?
Calculate the volume of concentrated sulphuric acid needed to prepare 1.90 L of 0.470 MH2SO4 solution when the commercially available concentrated sulfuric acid is 18.0 MH2SO4.