We’re being asked to calculate the percent by mass (mass %) of Cr in a 5.60 g steel.
The formula for mass or weight percent is:
We must first find the mass of Cr in the 250.0 mL solution. The flow for this problem will be like this:
Mass of BaCrO4(molar mass of BaCrO4)→ Moles of BaCrO4(mole-to-mole comparison)→ Moles of Cr (molar mass of Cr)→ Mass of Cr in 10.0 mL portion (volume ratio) → Mass of Cr in 250.0 mL solution → Calculate for mass % Cr in steel
A stainless steel alloy is to be analyzed for its chromium content. A 5.60g sample of the steel is used to produce 250.0 mL of a solution containing Cr2O72-? A 10.0-mL portion of this solution is added to BaCl2(aq). When the pH of the solution is properly adjusted, 0.145 g BaCrO 4(s) precipitates.
What is the percent Cr, by mass, in the steel sample?
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Mass Percent concept. You can view video lessons to learn Mass Percent. Or if you need more Mass Percent practice, you can also practice Mass Percent practice problems.
What professor is this problem relevant for?
Based on our data, we think this problem is relevant for Professor Panthi's class at St. Philips College.