What mass of oxygen gas is needed
When 31 g of phosphorus reacts with oxygen gas, 71 g of an oxide of phosphorus is the product. What mass of oxygen gas is needed to produce 13 g of this product? (2 significant figures).
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Electrons can be used to probe the arrangement of atoms on a solid surface if the wavelength of the electrons is comparable with the spacing between the atoms. Which of the following electron velocities would be appropriate for use in this applica
A 20.0-milliliter sample of .200-molar K2CO3 solution is added to 30.0 milliliters of .400-molar Ba(NO3)2 solution. barium carbonate percipitates.
The runner-up in a road race is given a reward that depends on the difference between his time and the winner's time. He is given 20 dollars for being one minute behind.
Predicting Membrane Protein Topology from Sequence You have cloned the gene for a human erythrocyte protein, which you suspect is a membrane protein.
Write four balanced equations for the reactions to separate and recover m-nitroanilin, benzoic acid, and naphthalene. Write out the full structures.
A 260-{rm mL} flask contains pure helium at a pressure of 759 {rm torr}. A second flask with a volume of 470 {rm mL} contains pure argon at a pressure of 725 {rm torr}.If the two flasks are connected through a stopcock and the stopcock is opened,
To produce 856 g of ammonia gas using air as your source of nitrogen gas, what volume of air is required if the air is introduced at 27°C and 760 mmHg? (the mole fraction of nitrogen gas in air is 0.781)
What mass of ethanol, C2H5OH a nonelectrolyte, must be added to 10.0 L of water to give a solution that freezes at -10.0C? Assume the density of water is 1.0 g/mL. Kf of water is 1.86C/m.
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The 2009 murders of four women in the Shafia family shocked Canadians and sparked national debate about multiculturalism, religious freedom, and gender equality
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