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calculate the volume occupied by 25.0 g of lead if the density of lead is 11.4g/cm^3 at 25 degrees celsius.
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- A chemistry student needs 70.0mL of pentane for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of pentane is ·0.626gcm−3 . Calculate the mass of pentane the student should weigh out.Write the net ionic equation for 3HNO3(aq)+Al(OH)3(S) = Al(NO3)3(aq)+3H2O(l) Express your answer as a balanced net ionic equation. Identify all of the phases in your answer.Complete and balance each of the following equations for gas-evolution reactions. HNO3(aq)+Na2SO3(aq)→ Express your answer as a chemical equation. Identify all of the phases in your answer. I don't know how to tell if it will be a gas or a liquid or a solid.
- Convert the following measurement. kg 4 5.4 x 10 g mol · L mol · dLP1A.10 Ozone is a trace atmospheric gas which plays an important role in screening the Earth from harmful ultraviolet radiation, and the abundance of ozone is commonly reported in Dobson units. Imagine a column passing up through the atmosphere. The total amount of O3 in the column divided by its cross-sectional area is reported in Dobson units with 1 Du =0.4462 mmol m−2. What amount of O3 (in moles) is found in a column of atmosphere with a cross-sectional area of 1.00 dm2 if the abundance is 250 Dobson units (a typical midlatitude value)? In the seasonal Antarctic ozone hole, the column abundance drops below 100 Dobson units; how many moles of O3 are found in such a column of air above a 1.00 dm2 area? Most atmospheric ozone is found between 10 and 50 km above the surface of the Earth. If that ozone is spread uniformly through this portion of the atmosphere, what is the average molar concentration corresponding to (a) 250 Dobson units, (b) 100 Dobson units?A certain substance X has a normal boiling point of 131.9°C and a molal boiling point elevation constant =Kb·1.78°C·kgmol−1. A solution is prepared by dissolving some urea ((NH2)2 CO) in 600.g of X. This solution boils at 133.7°C. Calculate the mass of urea that was dissolved. Round your answer to 2 significant digits.
- the concentration of carbon monoxide in an urban apartment is 48.0 ug/m^3. what mass of carbon monoxide in grams is present in a room measuring 9.0ft*14.5ft*18.8ftA geochemist measures the concentration of salt dissolved in Lake Parsons and finds a concentration of 69.32 g.L The geochemist also measures the concentration of salt in several nearby non-isolated lakes, and finds an average concentration of 5.02 g⋅L¯¹. Assuming the salt concentration in Lake Parsons before it became isolated was equal to the average salt concentration in nearby non-isolated lakes, calculate the percentage of Lake Parsons which has evaporated since it became isolated. Be sure your answer has the correct number of significant digits.A chemistry student needs 65.0mL of diethylamine for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of diethylamine is ·0.706gcm−3 . Calculate the mass of diethylamine the student should weigh out.