The average atomic mass of fictitious element Z is 261.4 amu. Z has only 2 isotopes. One of its isotopes has an atomic mass of 260.0 amu the other 264.0 amu. Choose the abundance for the isotopes. 55%
44%
35%
99%
25%
1%
11%
65%

Kc = 0.040 for the system below at 450oc. if a reaction is initiated with 0.40 mole of cl2 and 0.40 mole of pcl3 in a 2.0 liter container, what is the equilibrium concentration of cl2 in the same system? pcl5(g) ⇄ pcl3(g) + cl2(g)

Take a look at this dandelion. the yellow flower on the right is pollinated and the seeds on the left are transported by

Glucose (c6h12o6) is an important biological molecule. (round the answer to nearest hundredth.) what is the percent by mass of carbon in glucose?