1.30 grams of chromium reacts with 9.5 grams of iodine. What is the percent of chromium in this compound? How do I work out this answer. I know answer is 12.02, but can figure out how to get it! Thanks!
To determine the percent composition of chromium in the compound, you will need to calculate the mass of chromium and the total mass of the compound first.
Step 1: Calculate the mass of chromium:
The given mass of chromium is 1.30 grams.
Step 2: Calculate the mass of iodine:
The given mass of iodine is 9.5 grams.
Step 3: Calculate the total mass of the compound:
To find the total mass of the compound, add the masses of chromium and iodine:
Total mass = mass of chromium + mass of iodine
Total mass = 1.30 grams + 9.5 grams
Total mass = 10.80 grams
Step 4: Calculate the percent composition of chromium:
To find the percent composition of chromium, divide the mass of chromium by the total mass of the compound and multiply by 100.
Percent composition of chromium = (mass of chromium / total mass) x 100
Percent composition of chromium = (1.30 grams / 10.80 grams) x 100
Percent composition of chromium ≈ 0.1204 x 100
Percent composition of chromium ≈ 12.04%
Therefore, the percent of chromium in the compound is approximately 12.04%.
To find the percent of chromium in the compound, you need to determine the ratio of the mass of chromium to the total mass of the compound, and then express it as a percentage.
First, let's determine the molecular formula of the compound formed by chromium and iodine. We can do this by using the concept of the law of definite proportions, which states that elements combine in fixed ratios by mass to form compounds.
Given:
Mass of chromium = 1.30 grams
Mass of iodine = 9.5 grams
Next, we need to find the molar masses of chromium and iodine. The molar mass is the mass of one mole of a substance and is expressed in grams per mole.
Molar mass of chromium (Cr) = 52.00 grams/mole
Molar mass of iodine (I) = 126.90 grams/mole
Now, we can calculate the number of moles of each element in the given masses.
Number of moles of chromium = Mass of chromium / Molar mass of chromium
= 1.30 grams / 52.00 grams/mole
= 0.025 moles
Number of moles of iodine = Mass of iodine / Molar mass of iodine
= 9.5 grams / 126.90 grams/mole
= 0.075 moles
Based on the balanced chemical equation, we know that chromium and iodine react in a 1:3 ratio. This means that for every 1 mole of chromium, 3 moles of iodine are required.
Therefore, the number of moles of chromium in the compound is 0.025 moles.
To find the total mass of the compound, we need to calculate the sum of the masses of chromium and iodine.
Total mass of the compound = Mass of chromium + Mass of iodine
= 1.30 grams + 9.5 grams
= 10.80 grams
Now, we can calculate the percent of chromium in the compound.
Percent of chromium = (Mass of chromium / Total mass of the compound) * 100
= (1.30 grams / 10.80 grams) * 100
= 12.04%
Therefore, the percent of chromium in the compound is approximately 12.04%.