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A rectangular block of plastic, measuring 2.50 cm by 1.12 cm by 1.41 cm, floats in the middle of the Pacific Ocean. The volume of sea water displaced by the plastic block is 2.37 cm3. Assuming the density of the sea water is 1.025 g/mL, what is the density of the plastic?
At the freezing point of ethanol, C2H5OH, -115 degree C, the Enthalpy of fusion is 4.60 kJ/mol. What is the the enthalpy change when 23.0 grams of ethanol melts?
What component of air will bring about this reaction and what is its approximate concentration in air? If you had a stoppered flask with basic luminol and then opened it to the air
If the copper is drawn into wire whose diameter is 8.50 mm , how many feet of copper can be obtained from the ingot? The density of copper is 8.94 g/cm^3 .
A copper wire (density = 8.96 g/cm3) has a diameter of 0.44 mm. If a sample of this copper wire has a mass of 50. g, how long is the wire?
What is the pressure exerted by some nitrogen gas collected in a tube filled with water on a day when the room temperature is 18.0ºC
Calculate the pH of the resultant mixtures: a. 10 ml of 0.2 M Ca(OH)2 + 25 ml of 0.1 M HCL b. 10 ml of 0.01 M H2SO4 + 10 ml of 0.01 M Ca(OH)2 c. 10 ml of 0.1 M H2SO4 + 10 ml of 0.1 M KOH
An equilibrium mixture in a 2.00 L vessel is found to contain 0.0406 mol CH3OH, 0.170 mol CO, and 0.302 mol H2 at 500 K. Calculate Kc at this temperature.
When we go down a group, electron affinity should become more positive (less energy released), since the electron is added at increasing distances from the nucleus.
A 100.0 mL of acetic acid solution of unknown molarity is titrated with 0.15 M NaOH solution. The titration requires 43.25 mL of the base. Determine the molarity of the acid, CH3COOH.
If the volume of an unknown liquid is measured and found to be 6.510 L, what is the volume of the unknown liquid in milliliters?
List the following compouns from highest to lowest frequency.
What mass of oxygen would be required to convert the same sample of nitrogen to nitrogen dioxide (NO2) instead?
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