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1- Sodium and water react according to the equation 2Na +2H2O=>2NaOH + H2. What number of moles of H2 will be produced when 4.0 mol Na is added to 3.3 mol H2O?
2-Consider the reaction Mg2Si +4H2O=>2Mg(OH)2 + SiH4 How many moles of excess reactant are left over if we start with 23.2 g of each reactant?
A solution is prepared by mixing 50.0 mL of 0.11 M Pb(NO3)2 with 50.0 mL of 1.3 M KCl. Calculate the concentrations of Pb2+ and Cl - at equilibrium. Ksp for PbCl2(s) is 1.6* 10-5.
The initial volume of the balloon is 5.00 L, and the pressure is 760 mmHg. The balloon ascends to an altitude of 20 km, where the pressure is 76.0 mmHg and the temperature is -50 degrees celsius. What is the new volume,V2 , of the balloon in liter..
Rare bacteria arriving on an asteroid from the invisible moon Teflonia eat C2F4 and use this raw material to make poly-TFE as their cell walls. (PTFE is teflon.) What happens to the equilibrium if the bacteria are added to the reaction mixture?
Which reaction below could not be used to create C-C bonds?
an analytical lab needed to determine the content of phosphorus in a commercial sample of plant food. the phosphorus in
A 1.30 g sample of dry ice is added to a 760 mL flask containing nitrogen gas at a temperature of 25.0 degrees Celcius and a pressure of 735 mmHg. The dry ice is allowed to sublime.
In Photosystem II of the thylakoid membrane of chloroplasts, approximately 16.3 moles of photons must be absorbed by chlorophyll pigments in order to obtain enough energy to produce one molecule of glucose
A 2.00-L flask is filled with propane gas (C3H8) at 1.00 atm and -15.0 degree C. What is the mass of the propane in the flask?
a 27.2 ml sample of a solution of rboh is neutralized by 16.12 ml of a 2.047 m solution of hbr. what is the molarity of
Calculate the wavelength in meters of light absorbed by an electron in an atom of hydrogen as it moves from n = 3 to n = 6.
Acetic acid, CH3COOH, is a weak organic acid, pKa 4.47. Determine the position of the equilibrium for the reaction of acetic acid with CH3ONa. Draw the species that predominate at equilibrium. Skip drawing the metal counter ion.
Arrange the following sets of compounds in order of increasing heats of vaporization. explain your choices CH3F, HF, and Ne H2S, SiH4, and H202
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