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A block of metal has a width of 3.2 cm, a length of 17.1 cm, and a height of 2.7 cm. Its mass is 1.5 kg. Calculate the density of the metal. Express in grams per cubic centimeter using two significant figures.
A sample of nitrogen has a volume of 630 mL at a temperature of 49 degC. Assuming that the pressure is constant, what will be the volume when the temperature is 348.6 degC.
What is effective diffusion coefficient of CH4 in the nanochannel at the feed gas conditions? Is Knudsen diffusion important?
An environmental engineer analyzes a sample of air contaminated with sulfur dioxide. To a 500. mL sample of air at 700. torr and 38°C, she adds 20.00 mL of 0.01017 M aqueous iodine, which reacts as follows:
The temperature of 55.6 g of a material decreases by 14.8C when it loses 3080 J of heat. What is its specific heat?
If 3.98 g of copper was recovered and you started with 9.10 g of copper (II) chloride, then what is the percent yield of the reaction ?
a column of air with a pressure of 1.57 x 105 Pa and an area of 1.07 m2 and given that the acceleration due to gravity is 9.8 m/s2, what is the mass of the column.
A helium-filled weather balloon has a volume of 2.4 × 102 L at 99 kPa pressure and a temperature of 0°C. What is the mass of the helium in the balloon?
Calculate the percent of a strontium sample left after 100 years. The half-life of strontium-90 is 28.1 years.
The product of the complete hydrolysis contained 1.8 mg of the compound shown below, and no other 2,4-dinitrophenyl derivatives of the ?-amino groups of other amino acids could be found How many polypeptide chains are in this protein?
Describe the attractive and repulsive forces between an atom of oxygen and an atom of sodium .
What is the molarity of a calcium hydroxide solution if a 25.0 mL sample is exaclty neutralized by 42.5 mL of 0.0750 M nitric acid?
To ensure the impurity does not exceed this amount, how much water must be added to the solution before the temperature is dropped if the initial solution weighed 500 kg? How much Na2S2O2 will be generated in this process?
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