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A solution containing 25.6 g of sulfur dissolve in 1000g of naphthalene gave a freezing point lowering of 0.680. what is the molar mass of solute? For naphthalene k(6.8k/m)
A 45.60g sample of a gaseous flurocarbon contains 7.9g of carbon and 37.66g of fluorine and occupies 7.40L at STP(P=1.00atm and T=273.15k). Determine the approximate molar mass of the flurocarbon and give it's molecular formula
A solid hydrocarbon is burned in air in a closed container,producing a mixture of gases having a total pressure of 3.34 atm. Analysis of the mixture shows it to contain 0.340g of water vapour,0.792g of carbon dioxide,0.288g of oxygen,3.790g on nitrogen and no other gases. Calculate the mole fraction and partial pressure of carbondioxide in this mixture
arrange the compounds in increasing in terms of Melting Point and Velocity
H2O, H2S, Br2, NaCl
Determine the volume/volume percent solution made by combining 25 mL of ethanol with enough water to produce 200 mL of the solution.
how many moles of PCl5 can be produced from 58.0 g of Cl2 (excess P4)
how many moles of PCl5 can be produced from 58.0 g of Cl2 (excess P4)
2. A 0.2719 g sample containing
a reacted with 20.00 mL of 0.2254 M HCI.
Given that HCI was excess. The excess HCI required exactly 20.00 mL of 0.1041
M NaOH to reach the end-point using phenolphthalein indicator.
Determine percentage purity of
3() +2
( ) -
2( )+2 20 (1)
The titration reaction is
a in the sample. The reaction involved is
( ) + NaOH(aq)
CI( ) + 2 (1)
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A copper metal with a mass of 7.56g cools from 65.1⁰C to 11.2⁰C. Find the heat released by the metal.
