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Automobile airbags inflate when sodium azide, NaN3, decomposes explosively to form the elements, Na (s) and N2 (g). How many grams of NaN3 are needed to produce 5.00 g of nitrogen gas? (Molar masses, NaN3 = 65.02 g/mol, Na = 22.99, N2 = 28.02 g/mol)
Lysine is an amino acid that is an essential part of nutrition but which is not synthesized by the human body.
When sodium reacts with chlorine, 411 kj/mol is released. Calculate the amount of heat released if 1.37 mol of sodium form.
What volume of hydrogen gas is produced when 62.0 g of sodium reacts completely according to the following reaction at 25 oC and 1 atm? sodium (s) + water (l) ----sodium hydroxide (aq) + hydrogen (g)
a 1.30 gram sample of dry ice is added to a 755ml flask containing nitrogen gas at a temperature of 25.0 degrees
Calculate the pH at the midpoint and at the equivalence point for a titration of 25mL of 0.100M potassium hydrogen phthalate with 0.100M KOH.
According to the Born-Haber Cycle, find the lattice energy of magnesium chloride. How does your result explain the energetic favorability of ionic solid formation
If you measured absorbances of a product in different solutions at 470 nm and used a molar extinction coefficient of 4234 M^-1 cm^-1 in your calculations.
a sample of 0.600 moles of metal M reacts completely with excess of flourine to form 46.8g of MF2. How many moles of F are present in sample of MF2 that forms?
What mass of water is necessary to prepare each of the following solutions? 1.) 200.0g of 1.30\% saline solution 2.) 80.00g of 15.0\% sugar solution
If an incoming energy to a photoelectric effect problem is 2.35 x 109 MHz and you hit a metal surface that has an ionization energy of 6.5 x 10-19J, what would the wavelength of the ejected electron be
Suppose that you have a 2.0 L sample of hydrogen at 1.00 atm and 59°C. If you heat the sample to 84°C and it expands to a volume of 3.7 L, what will the final pressure be?
carotenoids present in all organisms capable of photosynthesis extend the range of light absorbed by the organism. they
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