题目

Feed the world With the global population expected to rise to 9 billion within 50 years, feeding the world has never seemed such a daunting task. But GM(转基因)technology is giving hope to developing countries, where many people think biotechnology can offer improved nutrition, health and prosperity(繁荣).High hopes Many scientists in Africa regard GM crops as the only way to avoid mass starvation (饥饿) on the continent. Kenyan researchers recently created a GM sweet potato that they predict could increase yields by up to 80 percent. Meanwhile, South African scientists have铝能与浓氢氧化钠反应，生成一种无色无味的气体．（1）请完成该反应的化学方程式：2Al+2NaOH+2H20=2NaAlO2+______；（2）用10.0g氢氧化钠固体配制20%的氢氧化钠溶液，需加水______mL；（3）若用上述溶液与铝反应（假设NaOH全部反应）．计算反应后所得溶液中NaAlO2的质量分数．（计算结果准确至0.1%）