## Chemistry 12th Edition

a) $5.87\times10^{12} mi$ b) $2962.66 cm$ c) $98.43\times10^6 ft/s$
a) 1 light year = 365 days= 31536000 s speed of light= $3\times10^8 m/s$ =$186282 mi/s$ $t=31536000 sec$ $V=186282 mi/s$ $d=V\times t$ $=31536000 \times 186282$ $\approx 5.874589152\times10^12mi$ $=5.87\times10^12 mi$ b) $1 yard = 91.44 cm$ $32.4 yards = 32.4 times 91.44$ $\approx 2962.656 cm$ $= 2962.66 cm$ c) $1 cm/s = 32.81\times10^{-4} ft/s$ $3\times10^10 cm/s = (3\times10^10)\times(32.81\times10^{-4})$=98.43\times10^6 ft/s\$