8) what is the empirical formula for ethyl fluoride if the compound contains 49.97% carbon, 10.51% hydrogen, and 39.52% fluorine by mass?

What is a positive exponent means?

True or falseheat is a measure of the amount of internal molecular vibrations in an object. temperature is the scale to measure heat. (sec. 4.3)

Calculate the concentration of an aqueous solution of Ca (OH) 2 that has a pH of 12.01. Express your answer using two significant figures.

What is true about tRNA's: O they vary widely in size O they can covalently bond to more than one type of amino acid 0 they do not have any stem loop structures O they contain an anticodon triplet that recognizes a mRNA codon 0 there are exactly 20

Which of the following accurately represents the relationship between ceramic and metal?

Assume 3 molecules of Fe react according to the following equation. 3Fe + 4H2O Fe3O4 + 4H2 How many molecules of H2 are produced? How many water molecules are required? What is the mole ratio of Fe to H2O?

10.0 mL of a HF solution was titrated with a 0.120 N solution of KOH; 29.6 mL of KOH were required to completely neutralize the HF. Calculate the normality of the HF solution.

The number of grams present in 1.35 mol of Fe is

Which can associate a suspect's gun with a crime?

In which era did the first fish appear? a. Carboniferous b. Paleozoic C. Mesozoic d. Permian