Consider a calibration curve in which solution absorbance is plotted on the y-axis and solution concentration (M) is plotted on the x-axis. A linear regression of the calibration data yields a straight line with the formula: y= 26x + 0.081. If the absorbance of an unknown solution is 0.4428, what is the concentration of the unknown solution? a. 0.0139 M. b. 0.0181 M. c. 0.0256 M. d. 0.0321 M.

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false

When the speed of the bottle is 2 m/s, the average maximum height of the beanbag is m.

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?