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Gypsum is hydrated calcium sulfate. a 4.89 g sample of this hydrate was heated, and after the water was driven off, 3.87g anhydrous calcium sulfate remained. Determine the formula of this hydrate and name the compound.
At 580 nm the wavelength of its maximum absorption, the complex FeSCN2+ has a molar absorptivity of 7X10^3 L cm-1 mol-1 calculate
draw an orbital picture for acetylene C2H2 label each bond type and indicate type of orbitals involved in each bond.
in the titration of 50.0 ml of 1.0 m methylamine ch3nh2 kb 4.4 10-4 with 0.50 m hcl calculate the ph under the
pvc processors use a very high molecular weight acrylic processing aid for production of rigid pvc foamsheet of high
What volume will it occupy at each of the following temperatures if the pressure and number of moles are constant
A 10.0-gram sample of an unknown solid monoprotic acid is dissolved in water and titrated with 0.789 M NaOH, requiring 40.6 mL to reach the endpoint. Determine the molar mass of the unknown acid.
a 175.0g sample of a compound contains 56.15g C, 9.43g H, 74.81g O, 13.11g N, and 21.49g Na. What is the compound's empirical formula?
A beta -emitting radiation source gives 250 units of radiation at a distance of 5.0m.At what distance does the radiation drop to one-tenth its original value
What is the final concentration if 75.0ml of a 3.50M glucose solution is diluted to a volume of 400.0ml
Draw the product that is formed when the compound shown below is treated with an excess of HCl. Draw only the organic ion.
Vitamin B12, also known as cobalamin, has the molecular formula C63H88N14PO14Co. What mass of CO2 and H20 would be produced during the combustion analysis
Calculate the frequency (Hz) of the photon absorbed when the electron goes from a n= 3.00 energy level to a n= 4 energy level. Express answer in scientific notation.
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