百度试题 结果1 题目In one mole of a solution with a mole fraction of 0.5 water, how many water molecules would there be? A. 0.5NA B. 1.0NA C. 0.25NA D. 2.0NA 相关知识点: 试题来源: 解析 A 反馈 收藏
1. the smallest physical unit of an element or compound, consisting of one or more like atoms in an element and two or more different atoms in a compound. 2. a quantity of a substance, the weight of which is numerically equal to the molecular weight; gram molecule. 3. any very sma...
Water is composed of two hydrogen atoms and one oxygen atom, forming a molecule. 水由两个氢原子和一个氧原子组成,形成一个分子。 The molecular weight of this compound is 120 grams per mole. 这个化合物的分子量是每摩尔120克。 The molecular structure of DNA is very complex. DNA的分子结构非常...
aWe can therefore approximately find the volume of one molecule by dividing the volume of a mole of a liquid, for example, water, by the number of molecules in a mole N . 因此我们在痣N.可以通过划分液体,例如,水的痣的容量近似地发现一个分子的容量,由分子的数量。[translate] ...
Molecules are made up of two or moreatoms, either of the sameelementor of two or more different elements, joined by one or more covalentchemical bonds. According to the kinetic-molecular theory, the molecules of a substance are in constant motion. The state (solid, liquid, or gaseous) in ...
compound in atomic mass units. One mole of a compound contains 6.022x1023molecules of the compound. Themass ofone mole of a compound is called itsmolar weightormolar mass. Theunits for molar weightormolar massare grams per mole. Here is theformula for determining the numberof moles of a ...
molecular genetics, molecular weight, molecularity, molecule, moleculelattice, molecules, moleculo-dosiology, mole-electronics, molefraction, molehill, 英汉-汉英词典 分学 英语例句库 organic molecules are present in comets. 彗星上存在有机分。 molecules with unpaired valence electrons. 带有不成对价电...
Molecular Mass and Mole ConceptMolecular Mass- It is equal to the sum of the atomic masses of all the atoms present in one molecule of that substance. It is expressed in atomic mass units \(\left( {{\rm{amu}}} \right).\)For example- the molecular mass of \({\rm{HN}}{{\rm{O...
calculations is 1.00 gram per millilitre (1 g/mL). In other words, 1 millilitre of water has a mass of 1 gram. One drop of water is 0.05 mL of water, so its mass would be 0.05 grams. One mole of water is 18.016 grams, so in 0.05 grams, in one drop, the number of moles is...
One mole of cis-platin contains Avogradro's # of molecules (6.022 x 10 23 molecules) so the number of hydrogen atoms is 6 x 6.022 x 10 23 = 3.6 x 10 24 . The molar mass of Pt(NH 3 ) 2 Cl 2 is 300.1 g/mol. 3. The number of electrons in a strontium atom is 38, the ...