A substance is allowed to diffuse along a 10-cm length of tubing filled with water. The cross section of the tube is 5.3 cm2 . If the diffusion coefficient is 5.0 × 10^¯10 m2/s, and 6.5 × 10^¯14 kg is transported along the tube in 16 s, what is the difference in the concentration levels of the substance at the two ends of the tube?
a. 3.9E–1 kg/m3
b. 4.3E–2 kg/m3
c. 1.5E–3 kg/m3
d. 8.1E–4 kg/m3
c
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Element A, mass 5.00 g, reacts exactly with 2.00 g of element B to form 7.00 g of compound AB. If 10.00 g of element A are reacted with 2.00 g of element B to form the same compound, what mass of compound AB will be formed?
a. 7.00 g b. 5.00 g c. 17.00 g d. 12.00 g
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