Atomic weight of the element
An element crystallizes in a body-centered cubic lattice. The edge of the unit cell is 3.17 A, and the density of the crystal is 6.99 g/cm^3. Calculate the atomic weight of the element.
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Draw all constitutional isomers of C3H6O. For each of the constitutional isomers, show possible stereoisomers. Are the melting points of the stereoisomers different?
Calculate the initial velocity of a reaction in terms of V max if the substrate concentration is 1/2 the Km. Show the calculations.
A 40607 lb force is applied to a surface that measures 79 in long and 8 in wide. Determine the pressure exerted on the surface by the force in both psi and Pa. 1 Pa = 1.45×10-4 psi.
The half-equivalence point of a titration occurs half way to the end point, where half of the analyte has reacted to form its conjugate, and the other half still remains unreacted.
A sample of solid having a density of 3.43 g/cm3 had an apparent mass of 13.9264. The density of the balance weights is 8.00 g/cm3. Calculate the true mass of the object.
Provide a structure for the following compound: EI mass spectrum: two molecular ions of about equal intensity at m/z = 180 and 182; IR: 1740 cm-1; 1H NMR: 1.30 (3H, t J = 7 Hz); ? 1.80 (3H, d, J = 7 Hz); ? 4.23 (2H, q, J = 7 Hz); ? 4.37 (1H, q, J
Calculate the total calories absorbed from the surroundings. D. ?H for Solution of KCl(s) in water: ?T for reaction D: -4°C Mass of KCl: 5.00 g Volume of water: 0.050 L
Calculate the pH when 4.73 g of HCOONa is added to 211.0 mL of 0.50 M formic acid, HCOOH. Ignore any changes in volume. The Ka value for HCOOH is 1.8 x 10-4.
Write the missing formulas in the chemical equations
The nitrogen is converted to N2(g) and collected. given that 350-mg same yields 42.2 ml N2 at STP, calculate the percentage of nitrogen in the sample.
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