Part A

$65\mathrm{.}88gCC{l}_4$

Express your answer to four significant figures.

Part B

$40\mathrm{.}01$kgNaHCO$3$

Express your answer to four significant figures.

Part $C$

$123\mathrm{.}40g{C}_4{H}_{10}$

Express your answer to four significant figures.

$N=$