Ineed with this
calculate the change in boiling point when 0.402 moles of sodium chloride are added to 0.200 kilograms of water. kf = -1.86°c/m; kb = 0.512°c/m

-2.1°c

2.1°c

-7.5°c

7.5°c

An alkaline battery produces electrical energy according to the following equation. zn(s) + 2 mno2(s) + h2o(l) zn(oh)2(s) + mn2o3(s) (a) determine the limiting reactant if 17.5 g zn and 31.0 g mno2 are used. (type your answer using the format ch4 for ch4.) (b) determine the mass of zn(oh)2 produced. _ g

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?