10 mL of a 1.0 solution is diluted to 100 mL. Then 10 mL of the diluted solution is removed and diluted again to 100 mL. What is the concentration of the second dilution?

Explanation:

Atoms don't disappear in chemical reactions, nor do they appear. ... Let's look at one of your examples: C2H6 + O2 = CO2 + H2O Assume that ... the equation: C2H6 + O2 = CO2 + H20 2*C, 6*H, 2*O 1*C, 3*O, 2*H This can't be ... 2 C2H6 + O2 = 4 CO2 + 6 H20 4*C, 12*H, 2*O 4*C, 14*O, 12*H Now we can