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【简答题】
2008年北京奥运会正在向我们走来，奥运火炬“祥云”处处闪现“科技之光”，体现“绿色奥运”理念． （1）与往届奥运会火炬的混合燃料不同，此次燃料采用丙烷（化学式为C 3 H 8 ），丙烷燃烧只形成水蒸气和二氧化碳，其火焰是橙色，具有较好的可视性．请写出丙烷在空气中完全燃烧的化学方程式______，丙烷分子中碳原子、氢原子的个数比是______，含有16g氢元素的丙烷的质量是______g； （2）北京奥运火种采集工作将于2008年3月25日在希腊奥林匹克进行．届时将用采集的火种点燃奥运火炬，则作为火种的物质应具有的化学性质是______．火炬将在世界范围内传递，于2008年5月首次到达珠穆朗玛峰峰顶．在那里火炬不容易燃烧，其原因是______．目前，我国的科技人员已成功解决了这一难题． （3）火炬外体采用轻薄高品质铝合金和优质有机材料加工合成，制作材料均为可回收的环保材料．请说出采用铝合金材料的两个优点是______、______．
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