On the other hand helium's molar mass it 4.003 grams per mole.

另一方面，氦的摩尔质量为每摩尔 4. 003 克。

Sodium chloride's molar mass is 58.45 grams per mole.

氯化钠的摩尔质量为每摩尔 58. 45 克。

So we want 31.1 grams of silver, the molar mass of silver is 107.868 grams per mole.

所以我们要 31. 1 克银，银的摩尔质量是 107. 868 克每摩尔。

At a molar mass of 44 grams per mole that's 0.16 grams of carbon dioxide.

在每摩尔 44 克的摩尔质量下， 即 0. 16 克二氧化碳。

Multiply the number of moles of each element by its molar mass and add them all up, that's the molar mass of the whole compound.

将每种元素的摩尔数乘以其摩尔质量并将它们全部相加，即为整个化合物的摩尔质量。

This is known as an element's molar mass. And now that we know the molar mass of elements we can calculate the molar mass of any compound.

这被称为元素的摩尔质量。现在我们知道了元素的摩尔质量，我们可以计算任何化合物的摩尔质量。

Now, as we always do, in order to make a reaction practical, you have to go through the final step of converting the formula equation into a molar mass equation.

现在，就像我们一直做的那样， 为了使反应切实可行，您必须完成将公式方程式转换为摩尔质量方程式的最后一步。

So, we plug that into the main formula -- chlorine gas has a molar mass of two times that of atomic chlorine -- 35.5 times two equals 70.9, and helium's molar mass is 4.00.

因此，我们将其代入主要公式——氯气的摩尔质量是原子氯的两倍——35.5 乘以二等于 70.9，氦气的摩尔质量为 4.00。

If we divide the 30 grams in the solution by it's molar mass of 34.014 grams per mole, we find that we have 0.88 moles of hydrogen peroxide per liter of solution.

如果我们将溶液中的 30 克除以每摩尔 34. 014 克的摩尔质量，我们发现每升溶液含有 0. 88 摩尔过氧化氢。

We also learned how to calculate molar mass and how to balance a chemical equation and finally, we talked about how to use molar ratios to calculate the amount of stuff that goes in and out of a reaction.

我们还学习了如何计算摩尔质量以及如何平衡化学方程式， 最后，我们讨论了如何使用摩尔比来计算进出反应的物质的量。