英语化学题,急（回答出里面任何一题都可以）1.How many moles of nitrogen,N,are in 90.0 g of nitrous oxide,N2O?2.How many moles of methane are produced when 48.1 moles of carbon dioxide gas react with excess hydrogen gas?3.How many mo

英语化学题,急（回答出里面任何一题都可以）1.How many moles of nitrogen,N,are in 90.0 g of nitrous oxide,N2O?2.How many moles of methane are produced when 48.1 moles of carbon dioxide gas react with excess hydrogen gas?3.How many mo
英语化学题,急（回答出里面任何一题都可以）
1.How many moles of nitrogen,N,are in 90.0 g of nitrous oxide,N2O?
2.How many moles of methane are produced when 48.1 moles of carbon dioxide gas react with excess hydrogen gas?
3.How many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 42.1 moles of water vapor?
4.he compound MgSO4 is called Epsom salts.How many grams will you need to prepare a bath containing 5.00 moles of Epsom salts?
5.In a bottle of soda,there is 0.20 mole CO2.How many grams of CO2 are in the bottle?
6.How many moles of O2 are required to react with 6.0 moles H2?
7.If you have 3.0 moles O2,how many moles of H2 are needed for the reaction?
8.How many moles of H2O form when 5.5 moles O2 reacts?
9.What is the molarity of a solution containing 16.8g of KCl in 314 mL of solution?
10.How many liters of a 5.0% （m/v） glucose solution would you need to obtain 95g of glucose?
第一题，Learning Goal:To convert between mass and number of moles.
The conversion factor between mass and number of moles is called molar mass.By consulting the periodic table ,we can determine that the molar mass of NaCl is
23.g/mole+35.g/mole=58.g/mole
This number tells us that 1 \rm mole of NaCl has a mass of 58.5 g .The conversion factors are
58.g/1~mole} and frac{1~mole}{58.g}
Here is an example of the conversion of 12.0 \ moles of \ NaCl to grams using the first conversion factor:
\rm 12.\cancel{\rm moles}\times\frac{58.g}{1~\cancel{\rm mole}}=702~g

英语化学题,急（回答出里面任何一题都可以）1.How many moles of nitrogen,N,are in 90.0 g of nitrous oxide,N2O?2.How many moles of methane are produced when 48.1 moles of carbon dioxide gas react with excess hydrogen gas?3.How many mo
1.molar mass of N2O = 2(14)+16 = 44g/mol
So in 90g of N2O there are 90/44 = 2.05mol N2O
Since you want the # mol of nitrogen,there are 2 moles of nitrogen in each mole of N2O
So # mol of N = 2(2.05) = 4.09 (4.10 would be a rounding error)
2.Reaction between CO2 and H2:
CO2 + 2H2 -> CH4 + O2
Since the mol:mol ratio of CO2 and CH4 is 1:1,48.1mol of CH4 will be produced.
3 - 逻辑和第二题一样
4.
Molar mass of MgSO4 = 24.305 + 32.06 + 4(16) = 120.365g/mol
=> Mass of 5mol MgSO4 = 5(120.365) = 601.8g
5.Mass of 1mol CO2 = 12 + 2(16) = 42g
Mass of 0.20 mol CO2 = (0.2)(42)=8.4g
6.Reaction between O2 and H2:
2H2 + O2 -> 2H2O
Mol:mol ratio is 2:1,so for 6 mol H2 you will need 6/2 = 3 mol O2
7.See above - answer is 6.
8.Mol:mol ratio between O2 and H2O is 1:2,so # of moles of H2O formed is 2(5.5) = 11mol
9.Molarity = mol/litre
molar mass of KCl = 39.1+35.45=74.55g/mol
# mol of KCl present = 16.8/74.55 = 0.225mol
314ml = 0.314L
Molarity = 0.225mol/0.314L = 0.718M
10.5% solution means there are 5g of glucose every 100ml.
So for 95g,you will need (95/5)*100 = 19*100 = 1900ml = 1.9L of solution

1.90g一氧化二氮里含有多少摩N原子？
3.多少摩氢气和二氧化碳反应能生成42.1摩尔水分子？

1.90克氧化二氮中有多少摩尔的N原子？
2.48.1摩尔的二氧化碳与过量氢气反应产生多少摩尔的甲？
3.产生42.1摩尔的水蒸汽需要多少摩尔氢气与过量的二氧化碳反应？
4.化合物硫酸镁又名泻盐，要准备一浴缸含5摩尔的泻盐的溶液需要多少克的硫酸镁？
5.一瓶苏打水有0.2摩尔的二氧化碳合多少克二氧化碳？
6.与6摩尔的氢气反应需要多少摩尔的氧气？
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1.90克氧化二氮中有多少摩尔的N原子？
2.48.1摩尔的二氧化碳与过量氢气反应产生多少摩尔的甲？
3.产生42.1摩尔的水蒸汽需要多少摩尔氢气与过量的二氧化碳反应？
4.化合物硫酸镁又名泻盐，要准备一浴缸含5摩尔的泻盐的溶液需要多少克的硫酸镁？
5.一瓶苏打水有0.2摩尔的二氧化碳合多少克二氧化碳？
6.与6摩尔的氢气反应需要多少摩尔的氧气？
7.3摩尔氧气需要与多少摩尔氢气反应？
8.5，5摩尔的氧气反应能生成多少摩尔的水？
9.314 mL 含16.8g KCl的溶液的克分子浓度是多少？
10.要含有95克葡萄糖，需要5%的葡萄糖溶液多少升？
补充1.学习目的：进行质量跟物质的量之间的转换。
质量与物质的量之间的转换因子称摩尔质量，通过查周期表，我们得到氯化钠的摩尔质量是23.0~g/mole+35.5~g/mole=58.5~g/mole。这个数值告诉我们每摩尔的氯化钠拥有质量58.5~g，转换因子就是58.5~g/1~mole}和{1~mole}{58.5~g}
例如要将12摩尔的氯化钠转换成质量就用第一个转换因子（同学用了什么化学软件吧？）

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