英文字典,中文字典,查询,解释,review.php


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       


安装中文字典英文字典辞典工具!

安装中文字典英文字典辞典工具!










  • Finding mole fraction from molality - Chemistry Stack Exchange
    I would like to ask some questions though 1 Xi stands for mole fraction of i-th component, so if for example I was asked to find the mole fraction of the solvent, instead of the solute, will the formula be the same? 2 The reason for expressing the molality in mol kg^-1 is so that it will have the same unit as the molar mass of the solvent? 3
  • How to convert from w w% to molarity? - Chemistry Stack Exchange
    Use the density of the solution to get the total volume of the solution Then use the weight percent of solute to determine the amount of substance of the solute Use the amount of substance of the solute divided by the volume to get molarity Molarity is relevant to our concept of chemistry and kinetics of reactions However wt wt% is frequently easier to use on an industrial scale
  • Mole Fraction and Atom Fraction - Chemistry Stack Exchange
    The mole fraction and atom fraction will be the same only if you are clearly talking about atoms But this is often not what is being talked about in typical chemistry conversations We might talk about the moles of sodium and the moles of sulfate in sodium sulphate, for example
  • What exactly does the term gram atoms mean?
    The Wikipedia article on the mole states: The term gram-atom (abbreviated gat ) has been used for a related but distinct concept, namely a quantity of a substance that contains Avogadro's number
  • Reason for the formation of azeotropes - Chemistry Stack Exchange
    A solution that has a maximum or minimum vapour pressure (vs mole fraction) is called an azeotrope The liquid is in equilibrium with the vapour and mole fractions in the liquid are the same as in the vapour at a given temperature
  • What is the mass of 1 atom of carbon? - Chemistry Stack Exchange
    Which is correct? Also what is dimension formula of relative atomic mass, molar mass? Why is unit of molar mass gram mole gram mole ${\displaystyle \frac{\text{gram}}{\text{mole}}}$ and not just gram gram $\text{gram}$ Since when has this mol mol $\text{mol}$ become a unit? It's just a number
  • Whats the difference between enthalpy of combustion and heat of . . .
    The standard enthalpy of combustion is the enthalpy change when one mole of a reactant completely burns in excess oxygen under standard thermodynamic conditions (although experimental values are usually obtained under different conditions and subsequently adjusted)
  • Why is it sometimes kJ only, and in other times kJ mol? Whats the . . .
    Heats of formation are typically defined as molar quantities, defined on a per-mole basis, for instance kJ mol The short of it is that people (myself included) are sometimes sloppy, and designation as a molar quantity and use of appropriate units is sometimes neglected


















中文字典-英文字典  2005-2009