A24.00 ml sample of a solution of pb(clo3)2 was diluted with water to 52.00 ml. a 17.00 ml sample of the dilute solution was found to contain 0.220 m clo3−(aq). what was the concentration of pb(clo3)2 in the original undiluted solution? 3.60 × 10−2 m 7.19 × 10−2 m 0.238 m 0.156 m 0.477 m

Agas mixture with a total pressure of 745 mmhg contains each of the following gases at the indicated partial pressures: co2, 245 mmhg ; ar, 119 mmhg ; and o2, 163 mmhg . the mixture also contains helium gas. part a what is the partial pressure of the helium gas? phe p h e = nothing mmhg request answer part b what mass of helium gas is present in a 10.2-l sample of this mixture at 283 k ? m m = nothing g request answer

Acurium-245 nucleus is hit with a neutron and changes as shown by the equation. complete the equation by filling in the missing parts. 52

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a.the mitochondria b.the nucleus c.the vacuoles d.the endoplasmic reticulum