When silicon was dissolved in an excess of alkali, 11.2 liters of gas were released. The mass of the reacted silicon is

bystudin | May 28, 2020 | Education

the number of moles of silicon = (the number of moles of hydrogen) / (2 * 22.4) = 11.2 / (2 * 22.4) = 0.25 mol
silicon mass = 0.25 * 28 = 7 g

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.