Chem help please!!!!!!?

Question

1-What determines a strong acid?

2-The pH of human blood is 7.35, what is the concentration of hydronium ion in blood?

3-What is the percent hydrogen in toluene?

4-What is the empirical formula for n-hexane?

please show any work that you did and explain how you got your answer :]

thanks sooo much <3

Answer 1

1-What determines a strong acid?

1 would be the strongest acid  7 is neutral 14 is alkaline or basic

          acid123456     7neutral    891011121314basic

i would consider anything beyond 4 to be a strong acid

2-The pH of human blood is 7.35, what is the concentration of hydronium ion in blood?

http://genchemist.wordpress.com/2007/09/...

3-What is the percent hydrogen in toluene?

5 of the 6 atoms are hydrogen in the molecule

http://en.wikipedia.org/wiki/Toluene

4-What is the empirical formula for n-hexane?

http://en.wikipedia.org/wiki/N-hexane

Answer 2

A strong acid is an acid that dissociates completely (the H+ separates from the rest of the molecule in water).  There are six acids commonly considered strong acids: HNO3, H2SO4, HCl, HBr, HI, and HClO4.

pH = -log[H+] = 7.35

log[H+] = -7.35

10^log[H+] = 10^(-7.35) = 4.47x10^-8 M

Toluene has the chemical formula C7H8, and the total molar mass is 92.14 g/mol.  H has a molar mass of 1.01, and C has a molar mass of 12.01 (both in g/mol).  So, by mass,

% H = 1.01*8/92.14 = 8.77%

% C = 12.01*7/92.14 = 91.2%

The formula for hexane (any isomer) is C6H14.  If you divide the coefficients by the greatest common factor, 2, you&#039;ll get C3H7, the empirical formula.