How many grams are in 3 moles of Nal?
How many grams are in 3 moles of Nal?
The Correct Answer and Explanation is:
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Correct Answer:
There are 449.37 grams in 3 moles of NaI (Sodium Iodide).
Step-by-Step Explanation
To determine how many grams are in 3 moles of NaI (sodium iodide), we need to use the molar mass of the compound and apply a simple formula from chemistry:
Mass (g) = Number of moles × Molar mass (g/mol)
Step 1: Determine the Molar Mass of NaI
NaI is a binary ionic compound made up of:
- Na = Sodium (atomic mass ≈ 22.99 g/mol)
- I = Iodine (atomic mass ≈ 126.90 g/mol)
Add these two together:
Molar mass of NaI = 22.99 + 126.90 = 149.89 g/mol
Step 2: Multiply by the Number of Moles
You are given 3 moles of NaI.
Mass = 3 moles × 149.89 g/mol = 449.67 grams
So, 3 moles of NaI = 449.67 grams.
(Note: Some periodic tables may round atomic masses slightly differently, which may cause tiny variations. For instance, using 126.91 for iodine results in 149.90 g/mol and a final value of 449.70 g. All are considered accurate within reasonable precision.)
Importance of Moles and Molar Mass in Chemistry
Understanding the relationship between moles and grams is fundamental in chemistry because atoms and molecules are too small to count individually. The mole is a standard unit used to express amounts of a substance based on number (Avogadro’s number, 6.022×10236.022 \times 10^{23}6.022×1023) rather than weight. The molar mass translates this number into grams for practical use in the lab.
In this case, knowing that 1 mole of NaI weighs 149.89 grams allows chemists to precisely measure out amounts needed for reactions, especially in biological or industrial settings where accurate dosing matters.
So, 3 moles of NaI corresponds to 449.67 grams of the compound.
