Calculate what is the molar mass of the solute
Pure benzene has a normal freezing point of 5.5°C. a solution containing 11.4g of a molecular substance dissolved in 150.0g of benzene (Kf=5.12°C/m) has a freezing point of 1.20°C. what is the molar mass of the solute?
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How many grams of sodium lactate should be added to 1.00 L of 0.160 M lactic acid to form a buffer solution with pH = 4.10? Assume that no volume change occurs when the sodium lactate is added.
Magnesium deficiency is a common problem in the United States. Magnesium salts (e.g. Magnesium chloride) are more bioavailable than are magnesium oxide or magnesium hydroxide, which are commonly found in vitamin supplements.
Hemoglobin contains 0.33% Fe by mass. A 0.200 g of sample is dissolved in water to give 10.0ml of solution, which has an osmotic pressure of 5.5 torr at 25.0 degree celsius. How many moles of Fe atoms are present in one mole of hemoglobin.
Explain the formation of line spectrum in the Balmer series of hydrogen atom. If the emitted photon has a wavelength of 434nm, determine the transition of electron that occurs.
The temperature of a 22.0 g sample of material increases from 190.0 degree C to 42.0 degree C when it absorbs 5.00 kJ of energy as heat. What is the specific heat of this material?
What would be the effect on your calculated mass percent recovery of Cu if you did not completely react the Mg in the reaction mixture? Briefly explain.
What's the difference between adding zinc metal to iodine with water and acetic acid vs. adding zinc metal to iodine with water without acetic acid?
A mixture of NaCl, SiO2, and CaCO3 is separated following the procedure given in this experiment. Indicate how each of the following procedural changes would affect the amount of the specified substance recovered. Briefly explain.
If clean magnesium metal burned in air it would form magnesium oxide. Suppose the magnesium had a this oxide coating. How would this affect moles of oxygen per mole of magnesium?
If certain car has a rated mileage of 30.0 miles per gallon, how many liters of carbon dioxide gas is generated when the car hasbeen driven a distance of 16.0 miles?
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