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Suppose If 100.0 g of powdered infant formula contains 1.66 g of CaCl2, Explain how many calcium ions are in a solution of 40.0 g of powdered formula mixed with 0.710 L of water?
A. 4.15 x 10-2 moles B. 1.50 x 10-2 moles C. 2.11 x 10-2 moles D. 5.98 x 10-3 moles E. 3.66 x 10-4 moles
if you were monitring the titation by visible spectroscopy what wavelength would you select for the data analysis? why?
Lithium will react with oxygen in a pressurized container to produce solid lithium oxide at 25°C. If 0.125 g Li(s) is placed in a 0.450 L container filled with oxygen at 1.85 atm, determine the final pressure inside the container
Suppose a worker fears being exposed. The source radiates wit 3540 rem at 500.0 cm. what minimal distance (m) should the worker remain?
An aqueous solution of a compound with a very high molar mass was prepared in a concentration of 29.7 g·L-1 at 25 °C. Its osmotic pressure was 0.184 ·102 Pa. Calculate the molar mass of the compound
A sample of vapor has the composition 50% A and 50% B. What is the composition of the boiling liquid that produced this vapor
A metal crystallizes in a body-centered unit cell with an edge length of 2.00 * 10^2 pm. Assume the atoms in the cell touch along the cube diagonal. The percentage of empty volume in the unit cell will be
have the same melting point.How can you determine if they are the same without using any form of spectroscopy? Explain in details.
Give the bond angle and describe the shape around the central atom designated in this molecule. O in HO of H3PO4 (no H-P bond) a. trigonal planar; 120° b. trigonal planar;
A graph of ln (K) versus 1/T for this reaction gives a straight line with a slope of 1.341X10^4 K and a y-intercept of -14.37. Determine the values of ΔH° and ΔS° for this reaction
degrees lower than the true freezing pont, would the calculated molar mass of the solute be too high or too low? Explain.
What is the pH of a solution obtained by mixing 50mL of 0.02 M sodium acetate with 40mL of 0.01 M HCl.
the enthalpy of formation of ethanol, C2H5OH, is -277.0 kJ/mol at 298.15k. calculate the enthalpy of combustion of one mole of ethanol, assuming that the products are CO2 (g) and H2O.
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