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在压强为30 MPa时，合成氨在平衡时混合气体中NH3的体积分数如下： 请回答： (1)根据表中数据，结合化学平衡移动原理，说明合成氨反应是放热反应的原因___。(2)根据下图，合成氨反应的热化学方程式是___。 (3)在一定温度下，将2 mol N2和6 mol H2通入到体积为1L 的密闭容器...
What mass of sodium chloride (NaCl) is needed to make 250 mL of 0.75 M NaCl solution? Describe how the solution is prepared. A buffer, using the amino acid, glycine, is prepared by mixing 80ml of 1.0M glycine, pH 0.5 (i.e. full...
Given the molecular weight of NaOH is 40, answer the following question: How much NaOH do you need to make 200 ml of 0.5 M NaOH solution? If I have 1 liter of a 1M solution of HCl, how many grams of NaOH must I add to neutra...
Calculate the gram weight of the solute to make 1 liter of solution. You can calculate gram weight from the given molarity of the solution using the formula MW X molarity. A 2M solution of sodium chloride requires 58.4 grams X 2M, or 116.8 grams in 1 liter. ...
Calculate the gram weight of the solute to make 1 liter of solution. You can calculate gram weight from the given molarity of the solution using the formula MW X molarity. A 2M solution of sodium chloride requires 58.4 grams X 2M, or 116.8 grams in 1 liter. ...
Experiments from each category were conducted in duplicate to make certain that the results are repeatable. First, quartz, ripidolite, HA, Fe- and Al oxide were weighed and added in 25 mL experimental tubes according to experimental categories. Second, 15 mL of the mixing solution prepared at...
互联网的发展加速了全球化进程。与此同时，一些不安全因素也借由互联网被叠加放大。个别组织和个人在互联网空间肆意兴风作浪，给国家安全造成威胁。在第三届世界互联网大会上，我国政府一直支持和倡议的网络主权理念，再次成为焦点，也凝聚起更多国际共识。下面关于在网络空间维护主权的说法，正确的是 ①网络主权是...
小刚在化学实验室发现，盛放NaOH溶液的试剂瓶瓶口和橡皮塞上出现了白色粉末。小刚认为该物质__，取回少量样品，设计实验证明该样品确实部分变质,并要小明帮他一起来探究这个实验。【实验目的】氢氧化钠部分变质,其成分是_【实验药品】水、酚酞试液、稀盐酸小刚通过以上实验，由此得出样品中氢氧化钠确实部分...
A buffer solution is made by adding 0.4 mol of acetic acid and 0.2 mol of sodium acetate to enough water to make 1L of solution. Determine the pH of the buffer solution. The Ka for acetic acid is 1.74 * 10^{-5} M use pH = pKa + log [CH3COO^-] / [CH3COOH ...