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What would be the approximate freezing point of 0.1 molar aqueous solution of aluminium chloride at room temperature assuming complete ionisation
What volume of ammonia gas at 24°C and 753 mmHg will be produced from 4.46 g of magnesium nitride?
An 18-karat gold necklace is 75% gold by mass, 16% silver, and 9.0% copper. How many grams of copper are in the necklace? If 18-karat gold has a density of 15.5 , what is the volume in cubic centim
If the total moles of gas does not change, what is the relationship between change in enthalpy and change in internal energy?
A mixture of 82.0 g of magnesium (24.31 g/mol) and 350 g of iron(III) chloride (162.2 g/mol) is allowed to react. What mass of magnesium chloride (95.21 g/mol) can be formed?
How does the Hammond postulate explain: a.) the greater selectivity for bromination vs. chlorination of an alkane?
What type of intermolecular forces are between CH3CH2CH2Cl and cis-CHClCHCl
Given the following two solutions: 0.200 M HC2H3O2(aq) with pKa = 4.76 0.200M NaOH(aq) A mixture is made using 50.0 mL of the HC2H3O2 and 25.0 mL of the NaOH.
A 31 L tank contains a gas under a pressure of 617 atm. What volume would the gas occupy at the same temperature at 900 torr of pressure? Answer in units of L.
A flask contains 0.160 of liquid bromine, . Determine the number of bromine molecules present in the flask.
A graduated cylinder contains 154 of water. A 15.0 piece of iron (density = 7.86 ) and a 18.0 piece of lead are added. What is the new water level in the cylinder?
When 56.0 g calcium and 34.7 g nitrogen gas undergo a reaction that has a 88.0% yield, what mass of calcium nitride forms?
Compute the molar mass of vitamin C if a solution of 22.7 g in 100. g of water freezes at -2.40 oC. The Kf of water is 1.858 oC kg/mol.
The vapor pressure of chlorine dioxide (ClO2) is 155 Torr at -22.75 ? C and 485 Torr at 0?C. What is the normal boiling point of chlorine dioxide? The universal gas constant is 8.314 J . K·mo
The first ionization energy of bismuth is E_{rm i1} = +703 {rm kJ/mol}. What is the longest possible wavelength of light that could ionize an atom of bismuth?
A system absorbs 192 kj of heat and the surroundings do 110 kj of work on the system. what is the change in internal energy of the system?
A solution is prepared by mixing 55.0 mL of 0.015 M BaCl2 and 150. mL of 0.045 M K2SO4. What are the concentrations of barium and sulfate ions in this solution?
Calculate the theoretical yield of when 108 g of C2H5Cl reacts with 236 g of , assuming that and react only to form C2H5Cl and HCl
In photosynthesis, plants use energy from the sun in combination with carbon dioxide and water to form glucose (C6H12O6) and oxygen.
Calculate the amount of heat required to heat a 3.9 gold bar from 27 to 69
A very dilute solution contains 116 mg of fructose (M=180.16 g/mol) in 1.00 liters of solution. It is placed in a semipermeable membrane bladder, which is then suspended by a support in some pure wa
What is the expected freezing point of a 0.50 m solution of Li2SO4 in water? Kf for water is 1.86°C/m.
What is the main overall driving force for any spontaneous reaction or change?
How many grams of dry NH_4Cl need to be added to 1.60 L of a 0.800 it M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.99? Kb for ammonia is 1.8*10^{-5}.
Distinguish between an absorption spectrum and an emission spectrum. With which did Bohr work?