答案(1)细节理解题。根据第一段"Mole came out of his hole near the river bank(河岸).(鼹鼠从靠近河岸的洞里钻了出来。)"和"And I haven't been here before.(我以前从来没有来过这里。)"可知,鼹鼠以前从没见过河,故选A。(2)推理判断题。根据第七段"Would you like ...
1 mole of water is heated by 1C°. The increased thermal energy makes additional microstates accessible. (The increase is by a factor of about 1020,000,000,000,000, 000,000,000.) Equal volumes of two gases are allowed to mix. The effect is the same as allowing each gas to expand to...
Step 1: Understand the mole fraction The mole fraction of methanol (CH₃OH) is given as 0.25. This means that in a solution, there are 0.25 moles of methanol for every 1 mole of solution. Step 2: Calculate moles of water Since the total mole fraction must equal 1, we can find the...
The Cape mediterranean region, part of South Africa's Cape Floristic Realm (CFR), is recognised for its rich diversity and high degree of endemism of terre... FCD Moor,JA Day - 《Hydrobiologia》 被引量: 43发表: 2013年 The Mole Concept. Scientific ConceptsSecondary School ScienceReports a st...
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What volume must 25 ml of 95% by mass of a solution H2SO4,density 1.80 g/ml, be diluted to produce 0.5 M solution? What is density of water in g ml? How do you convert 4 liters to milliliters? What is the mass of 53 mL of ethanol, which has a density of 0.79 g/mL?
6.What?That's it?I came all this way here to get stuck at the wrong end of this rock pile? 什么?居然这样?我千里迢迢来到这儿,难道就困在这个碎石桩的另一头? 7. An explorer is a friend to all,be it a plant,a fish or a tiny mole. ...
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number (6.02214076 × 1023) is the number of molecules that constitutes the atomic weight of a molecule in grams (g). For example, water is two hydrogen atoms with a weight of 1 g each and one oxygen atom with a weight of 16 g, meaning that one mole of water molecules weighs 18 g...
The number is derived from international agreement, based on the number of atoms in exactly 12 grams (g) of the carbon isotope "C-12." The convenience this "counting unit," the Avogadro number, provides is seen when considering, for example, the weights of 1 mole each of oxygen, water ...