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First, you can calculate the molar mass of FeCl2 by adding the molar masses of Fe (55.845 g/mol) and 2 atoms of Cl (2 times (35.446 g/mol). This gives a molar mass of 126.737 g/mol. Since each mole is 126.737 grams, you multiply 3.5 mols by 126.737 grams, giving you 443.58 grams. Comment.
- 6 min
- Sal Khan
- They are not the same thing but many people use the terms incorrectly Atomic mass and molecular mass should be in units of u (unified atomic mass u...
- The molar mass of any element is on the periodic table. For a molecule or compound, simply add up all the molar masses of the elements, taking subs...
- The basic idea is that your answer to a calculation shouldn’t have more significant figures than the initial quantity given has. The initial quanti...
- Traditionally, the most electronegative element is written last. However, there is no harm in writing ClNa, just as long as you know that chlorine...
- It's important to keep in mind significant figures are important for doing calculations in a science like chemistry. After a calculation would be a...
- This is true! This is the case because 1 mole of a molecule is equal to 6.02214076×10^23 (avogadros constant) individual molecules. Avogadros const...
- It is probably because the atomic mass of hydrogen is so small that the extra precision makes a more significant difference when doing calculations...
- The question says it’s a 1.52 kg sample of glucose. In order to use the molar mass of glucose (~180 g/mol), the 1.52 kg needs to be converted into...
- If you follow the maths of the units, it doesn’t yield mols as the answer. 1.52 kg is the total mass of the sample. And since glucose is a molecule...
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Understand molar mass. Molar mass is the mass (in grams) of one mole of a substance.[3] X Research source Using the atomic mass of an element and multiplying it by the conversion factor grams per mole (g/mol), you can calculate the molar mass of that element.Find the relative atomic mass of the element. An element's relative atomic mass is the average mass, in atomic units, of a sample of all its isotopes.[4] X Research source This information can be found on the periodic table of elements. Locate the element and find the number underneath the symbol for the element. It will not be a whole number, but will have decimals. For example, for hydrogen ...Multiply the relative atomic mass by the molar mass constant. This is defined as 0.001 kilogram per mole, or 1 gram per mole. This converts atomic units to grams per mole, making the molar mass of hydrogen 1.007 grams per mole, of carbon 12.0107 grams per mole, of oxygen 15.9994 grams per mole, and of chlorine 35.453 grams per mole.[5] X Research source Some elements are only found in ...While most relative atomic masses are known to a precision of 1 part in 10 thousand (4 decimal places), in most laboratory work, molar masses are normally quoted to 2 decimal places and fewer for particularly large masses. Thus, in the laboratory, the molar mass for hydrogen chloride would be given as 36.46 grams per mole and that of glucose as 180.14 grams per mole. Thanks Helpful 49 Not Helpful 54- 1.4M
Apr 30, 2018 · In the case of water, multiply the atomic weight of hydrogen by two, and the atomic weight of oxygen by one, then add the products. Numerically, this would be (2) (1.008) + (1) (16.00) = 18.016. This is the molar mass of the compound; it has units of grams per mole. Divide the mass of the compound in grams by the molar mass you just calculated.
- Michael Judge
The molar mass for this compound is computed to be 176.124 g/mol. The given number of moles is a very small fraction of a mole (~10 −4 or one-ten thousandth); therefore, we would expect the corresponding mass to be about one-ten thousandth of the molar mass (~0.02 g). Performing the calculation, we get:
Aug 8, 2017 · This chemistry video tutorial explains how to calculate the molar mass of a compound. It contains plenty of examples and practice problems.Introduction to M...
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- The Organic Chemistry Tutor
Aug 17, 2022 · Follow these simple steps to find the molar mass of a compound: Start with the chemical formula. Using a periodic table, look up the atomic mass of each element in the formula. (Note: Use different values if you are working with a known isotope.) Add up the atomic mass values of each element, according to the chemical formula.
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Jan 18, 2024 · Count the number of atoms of each element in the compound. Find the molar mass of glucose by multiplying the atomic masses of the atoms and their number, then find the sum: μ = 6 × 12.01 g/mol + 12 × 1.0079 g/mol + 6 × 16 g/mol = 180.1548 g/mol. If you know how to calculate molar mass, learn about other ways to express the amount of ...
