A25-ml solution of h2so4 is completely neutralized by 18 ml of 1.0m naoh. what is the concentration of the h2so4? h2so4(aq) +2naoh(aq) → na2so4(aq) + 2h2o(l)

1) Balanced chemical reaction

     H2SO4 (aq) + 2NaOH(aq) > Na2SO4(aq) + 2 H2O(liq)

2) Molar ratios

1 mol H2SO4 : 2 mol NaOH : 1 mol Na2SO4

3) Number of moles of NaOH

M = n / V => n = M * V = 1.0 M * 0.018 liter = 0.018 mol
of NaOH.

4) Determine the number of moles of H2SO4 using proportionality

1 mol H2SO4 / 2 mol NaOH = x / 0.018 mol NaOH

Solve for x:

x = 0.018 mol NaOH * 1 mol H2SO4 / 2 mol NaOH =0.009 mol H2SO4

5) Calculate the molarity using 0.009 mol and 25 mililiters

M = n / V = 0.009 mol / 0.025 liter = 0.36 M 

the concentration of the H2SO4 is 0.36 M

 

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant. 

The answer is b because c don't explain why the moths are on them and it isn't a because as we know only one species of moth does this