Can someone please help me with #2? Double Helix Structure of DNA Consider a ben

Question

Can someone please help me with #2?

Double Helix Structure of DNA Consider a benchtop synthesis reaction for a segment of DNA consisting of a helical arrangement of 14 nucleotides. (7 in each strand). The balanced chemical reaction for this hypothetical synthesis is given below. 14 C_5H_10O_4 + 4 C_5H_5N_2O_2 + 4 C_5H_5N_5 + 3 C_5H_5N_5O + 3 C_4H_5N_3O + 12 H_3PO_4 rightarrow C_137H_178O_106N_52P_12 + 12 H_2O + 12 H_2 If you allow 546.2 g of thymine, 456.7 g of adenine, 420.2 g of guanine and 514.6 g of cytosine to react in excess d-ribose and excess H_3PO_4, what mass of DNA may theoretically be produced? The human body is said to contain approximately 50.0 grams of DNA in the entire body. If the number of nucleotides in ONE STRAND of DNA is approximately 3.0 Times 10^6, and the average molar mass of a nucleotide is 327 g/mol, what is the average molar mass of an entire DNA double helix?

Explanation / Answer

One strand of DNA has 3 x 106 nucleotides

Mass of each nucleotide is 327 g/mol

SO mass of one strand of DNA is

3 x 106 x 327 = 9.81 x 108 g/mol

SO the double helix will be 2 x 9.81 x 108 g/mol = 1.96 x 109 g/mol

This is the average molar mass of an entire DNA double helix.

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