One of the primary substances used in sandpaper is Silicon carbide, SiC. It is produced by heating silicon dioxide, SiO2, with Carbon in a high intensity furnace. The other product is carbon monoxide, CO. What is the percent yield when 202 grams of SiC is produced from the reaction of 334.5 grams of carbon with 427 grams of SiO2? SiO2 (s) + C (s) → SiC (s) + CO (g) (unbalanced equation)

Benzonitrile (c6h5cn) is reduced to two different products depending on the reducing agent used. treatment with lithium aluminum hydride followed by water forms k, which has a molecular ion in its mass spectrum at 107 and the following ir absorptions: 3373, 3290, 3062, 2920, and 1600 cm-1. treatment with a milder reducing agent forms l, which has a molecular ion in its mass spectrum at 106 and the following ir absorptions: 3086, 2850, 2820, 2736, 1703, and 1600 cm-1. l shows fragments in its mass spectrum at m/z = 105 and 77. propose structures for k and l and choose an explanation for how this could be concluded.