245LC 7LC 8. A famous high-school chemistry teacher, Ms. Howells, has discovered

Question

245LC 7LC 8. A famous high-school chemistry teacher, Ms. Howells, has discovered a new element in the basement of her deteriorating school. The element, Lancerium (Lc), has two known isotopes: "Lc has a mass number of 295, and Lc has a mass number of 297. The molar mass of Lancerium is 296.21g/mol What are the percent abundances of the two isotopes? (10 pts) -25 A mystery liquid left out at Brooks Dining Hall was tested to determine its formula. The percent mpositions are as follows: 40.00% C, 6.71% H, and 53.29% o. a. What is the empirical formula of the mystery liquid? (8 pts)

Explanation / Answer

Empirical formula calculations:

Given percentage values:

C = 40%

H = 6.71%

O = 53.29%

We divide these values with the smallest amongst them, which is of hydrogen.

C = 40/6.71 = 5.96

H = 6.71/6.71 = 1

O = 53.29/6.71 = 7.94

The empirical formula for this compound is found by rounding the values to the nearest integer.

So the empirical formula is: C6O8H

Hope this helps !

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.