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Two determinations of the dissolved oxygen content of a 200 mL sample of water made five days apart, gave 5.3 ppm and 2.2 ppm of dissolved O2, respectively. What is the biological oxygen demand of the sample?
How much energy (in kilojoules) is released when 14.0 g of steam at 129.0^C is condensed to give liquid water at 78.0C? The heat of vaporization of liquid water is 40.67 kJ/mol, and the molar heat capacity is 75.3J/ K mol for the liquid and 33.6 J..
Cl revealed that it contains 33.33% C atoms by number and has a molar mass of 248.75 g/mol. What is the molecular formula of this compound?
An ice cube that is 25.00 g (temp -20 C) is placed into 225.00 g of H2O that is 22 degrees C. What will the temperature be when the ice cube has just melted. Use 4.184 J/K*g for the specific heat capacity of ice and water.
What is the molecular geometry around a central atom that is sp3 hybridized and has one lone electron-pair? a.bent, b. linear, c.trigonal-planar
For a certain reaction delta H=-76.8 and delta S=-217 If n=3 calculate E for the reaction at 25 degrees.
The reaction of methane and water is a way to prepare hydrogen according to CH4(g)+H2O=CO2(g)+H2(g) a) If 995 g of CH4 reacts with 2510 g of water, how many moles of reactants and products are there when the reaction is finished
Rewrite the following unbalanced equations, changing them into balanced net ionic equations (assume that all reactions are in water solutions)
Magnesium oxide decomposes into magnesium and oxygen. If 16.12 of magnesium oxide decomposes to form 9.72 of magnesium, what mass of oxygen gas is also released in the reaction
Initially, a gas occupies 45.4L at STP. What volume of gas (in L) will be occupied if the temperature increases to 49oC and a new pressure of 0.54 atm
If 8.0 moles of the gas A is placed in a 60.0 L tank with 1.0 moles of B at 0 degrees celsius and 1 atm, they react according to the equation. 2A(g) + B(g) ---> 3C(g) + D(g) How many moles are present in the tank when the reaction is complete
Calculate the radiation dosage (in grays) for an 57-kg person that is exposed for 3.0 seconds to a 3.0 Ci source of beta radiation.
Which of these products is formed under what is known as thermodynamic control, and explain mechanistically why this product predominates under thermodynamic conditions.
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