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An unknown element crystallizes in a cubic unit cell with an edge length of 3.46 Å. It has a density of 31.04 g/cm3. How many atoms are contained in one unit cell of of this element? The atomic mass of the element is 193.5 amu.
Determine how many grams of sodium chloride are required to prepare 250. mL of this solution. (if given the density of the saline solution is 1.0 g/mL)?
Discuss what you would observe after elution and visualization of a TLC plate having made the following mistakes in carrying out the analysis. Conceptual Organic chemistry
If 20.0 g acetylene is allowed to completely react with oxygen , how many g of O2 are reacted? 2C2H2 + 5O2→ 4CO2 + 2H2O
Determine the number of bonding electrons and the number of nonbonding electrons in the structure of SI2. Determine the number of bonding electrons and the number of nonbonding electrons in the structure of CO2.
As per the Haber Process(N2(g)+ 3 H2(g)= 2 NH3(g) ) ,what mass of nitrogen should you see in the reaction If you must produce 700g of ammonia? Percent yield of this reaction = 70%
How many grams of dry NH4Cl need to be added to 2.10 L of a 0.500 M solution of ammonia, NH3 , to prepare a buffer solution that has a pH of 8.76? Kb for ammonia is 1.8*10 ^-5.
a solid block of exactly 100.0 cm3 has a mass of 153.6g. Determine its density. will the block sink or float in water
The magnesium and calcium ions present in seawater([Mg2+] = 0.059 M and [Ca2+] = 0.011 M) can be separated by selective precipitation with KOH.
how many moles of glucose C6H12O6 can be burned biologically when 10.0 mole of oxygen is available
A sample of 0.2140 g of an unknown monoprotic acid was dissolved in 35.0 mL of water and titrated with 0.0950 M NaOH. The acid required 27.4 mL of base to reach the equivalence point.
A mixture of Ar and N2 gases has a density of 1.592 g/L at STP. What is the mole fraction of each gas?
How much heat is required to warm 219 g of ice from -45.7°C to 0.0°C, melt the ice, warm the water from 0.0°C to 100.0°C, boil the water, and heat the steam to 173.0°C
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