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Given data:moles of H2=0.001mole , given weight of the unknown metal(M)=0.0757 g given equation:M(s)+nH30^+1........>M^(+n)+ (n/2) H2 + nH2O from the stoichiometry of the reaction and the number of moles of H2 given,calculate the number of moles of metal in the sample.Assume that n in the balanced equation for the reaction is either 2 or 3.From the weight of the sample,then determine the two possible atomic masses of metals.Consult the periodic table to see which more nearly corresponds to a known metallic element.
A solution is prepared by mixing 50.0 ml of 0.10 MPb(No3)2 with 50.0 mL of 1.0 M KCl. Calculate the concentrations of PB+2 and Cl- at equilibrium(ksp=1.6 times 10^-5)
When heated to 350 degrees C at 0.950atm, ammonium nitrate decomposes into the following gases: nitrogen, oxygen, and water. How many grams of ammonium nitrate are needed to produce 5.00 L of oxygen?
A certain automobile of mass 1920 kg travels on a German autobahn at 120 km/h. What is the wavelength of the automobile?
A gas thermometer has a volume of 83.3 mL at 20 degrees C. After being placed in a container whose temperature is to be measured its volume ( at the same pressure ) dropped to 67.3 mL. The new temperature is?
The following plot shows experimental data from a reaction. What is the third half life of the reactions if the slope of the plot if 0.0023 1/M*s and the y-intercept is 0.45 1/M ?
When a 3.25 g sample of solid sodium hydroxide was dissolved in a calorimeter in 100.0 g of water, the temperature rose from 23.9 °C to 32.0 °C. Calculate ?H (in kJ/mol) for the solution process: NaOH (s) → Na+ (aq) + OH- (aq)
One way to recrystallize a solute from a solution is to change the temperature. Another way is to evaporate solvent from the solution. A 340 g sample of a saturated solution of KNO3 in water is prepared at 25.0.
the rate of bimolecular reaction is affected by concentrations of reactants presence of a catalyst and temperature, Concentration of a pure solid and a liquid can be ommitted from the equilibrium equation as the concentration ratio of these equal to..
The rate of formation of ammonia in the reaction N2(g) + 3 H2(g) ? 2 NH3(g) was reported as 1.15 M/h (moles per liter per hour). What is the rate of disappearance of H2(g)
a 75.0 ml sample of .0500M HCN is titrated with .500 M NaOH. what is the concentration of H+ in the solution after 3.0 ml of .500 M NaOH has been added
Using standard reduction potentials, calculate the standard E0 cell, (emf), for each of the following reactions. 1. Show half reactions
A 33.0 g sample of a nonelectrolyte was dissolved is 700. g of water. The solution's freezing point was -2.84°C.
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