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An element has hcp packing with a hexagonal unit cell. Its density is 3000 kg/m3 and the unit cell volume is 5.00 x 10-23 cm3. Calculate the molar mass (g/mol) of the element to three significant figures.
What velocity would an electron (9.11x10^-31kg ) need for its de Broglie wavelength to be that of red light (745 nm)?
what is the molar mass of gas if 0.250 g of the gas occupies 215 mL at 61 8mmHg and 30. 0C
What is the molarity of a solution made by dissolving 74.8 g of strontium perchlorate in sufficient water
Starting with 86.3 g NO and 25.6 g H2, find the theoretical yield of ammonia in grams
A cylinder with a moveable piston contains 0.90 mol of gas and has a volume of 342 mL. What will its volume be if an additional 0.22 of gas is added to the cylinder?
A sample of Au(ClO)3 is contaminated with LiClO. An acidified 0.2000 g of this mixture is treated with excess sodium iodide and subjected to iodometric titration.
As a food chemist for a major potato chip company, you are responsible for determining the salt content of new potato chip products for the packaging label. The potato chips are seasoned with table salt, NaCl.
The valve between these Tanks X and Y is opened and the gases are permissible to mix. After the gases have had time to mix, calculate the partial pressure of the oxygen gas?
for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 425mL of a solution that has a concentration of Na+ ions of 1.50M?
Write the equilibrium constant expression, Kc , for the following chemical reaction.
what is the mass of pentane that vaporizes? density is .626g/mL and pure vapor pressur eis 511 at 25 degree celcius. suppuse hexane and pentane each 75 ml is mixed in previoulsy evacuated 200 ml at 25 degree celcius.
A gas sample occupies a volume of 20cm^3 at 40 degree Celsius and at a pressure of 1.60atm. What volume will it occupy at STP?
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