Three molecules of type a, three of type b, three of type c, and three of type d are to be linked together to form a chain molecule. one such chain molecule is abcdabcdabcd, and another is bcddaaabdbcc. (a) how many such chain molecules are there? [hint: if the three a's were distinguishable from one another— a1, a2, a3— and the b's, c's, and d's were also, how many molecules would there be? how is this number reduced when the subscripts are removed from the a's? ]

The first element on the periodic table of elements is carbon. a. true b. false

George is a dalmatian puppy. describe what happens to light that allows you to see george’s black and white coat.

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.