80.0mL of a 1.00M HCl solution at 20.00Celsius is mixed with 80.0mL of a 1.00M Ca(OH)2 solution at 20.00 Celsius. If the final temperature of the mixture is 35.00*C, determine the heat of neutralization in kJ/mole. Assume a density of 1.00 g/cm3 and a specific heat of 4.184 J/goC. How do I approach this step by step?

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.