To improve the efficiency of fireplaces, technologies such as A. addition of catalytic combustors and B. <span>addition of boilers are used in so far. Addition of catalytic combustors hastens the process and makes use of inerts that cannot be used. The addition of boilers also adds to the efficiency by converting fluids to higher temperatures,</span>
Hydrocarbon tells you that it is a <span>six carbon compound containing a triple bond.</span>
This is an Engineering question, and the answer is reasonably simple. The mechanical advantage is given by:
MA =

on a lever or ramp system.
MA =

MA = 6.67 (there are no units, as MA is a ratio)
The correct answer to this question is the unique atomic number which would be B