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Sodium chlorate (NaClO3(s)) dissociates, during moderate heating to produce solid sodium chloride (NaCl(s)) and gaseous oxygen (O2 (g)). A 3.4671 g of impure sodium chlorate was heated until the evolution of oxygen stopped. The mass of sample residue was subsequently found to be 2.9073 g. What wt% of the original impure sample was really sodium chlorate? Assume that no gases will be evolved from the impurities.
Problem- If He(g) has an average kinetic energy of 4390 J/mol under certain conditions, what is the root mean square speed of Cl2(g) molecules under the same conditions
A particular application calls for N2 (g) with a density of 1.80 g/L at 32°C. What must be the pressure of N2 (g) in millimeters in mercury? What is the molar volume under these conditions
Chemicals found in water include a minerals such as a.calcium, silica and magnesium b. lead c.arsenic d.all of the above
Calculate the change in temperature for 4.5g of CaCl2 dissolved in 90.0mL of H20. Assume that calorimeter absorbs no heat. (Ccal=0)
Problem- In order to favor product formation, one of the reactants, acetic acid, is used in excess. Give two reasons why it is preferable to add excess acetic acid as opposed to excess isopentyl alcohol.
If 7.63 of an unknown gas occupies 79.1mL at 25.02 degrees celcius and 7.55 atm of pressure, what is the molar mass of the gas? R=0.0821
How many mls of 12M Acetic Acid must be added to 500 ml of 0.5M Sodium acetate to prepare a buffer of pH 4.76 (pKa of Acetic Acid is 4.76).
Write a balanced equation for the neutralization of each of the following: a)H3PO4(aq) and NaOH(aq) b)HI(aq) and LiOH(aq) c)HNO3(aq) and Ca(OH)2(s)
Explain what is the formula of a compound that contains hydrogen as +1, sulfur as +4 and oxygen as -2? Define how to do this
A gas sample has an original volume of 680 ml when collected at 720 mm and 28°C. What will be the volume of the gas sample if the pressure increases to 820 mm and the temperature increases to 55°C?
0.688g of antacid was treated with 50.00 mL of 0.5M HCl. the excess acid required 4.21 mL of 1.200M NaOH for back-titration. what is the neutralizing power of this antacid expressed as millimoles of HCl per gram of antacid
Calculate the pH of a buffer that contains 0.270 M hydrofluoric acid (HF) and 0.180 M cesium fluoride (CsF). The Ka of hydrofluoric acid is 6.8 x 10^-4.
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