Question

Chromium (Cr) can combine with chlorine (Cl2) to form chromium chloride (CrCl3). Which equation is a correct representation of this reaction?

A.
Cr + Cl2→ CrCl3

B.
2Cr + Cl2→CrCl3

C.
2Cr + 3Cl2→CrCl3

D.
2Cr + 3Cl2→ 2CrCl3

Answer 1

is it A @Skrteljnr

Answer 2

D

Answer 3

D

Answer 4

Iron forms rust, expressed as: Fe2O3. Using information from the Periodic Table, what is the mass of one mole of Fe2O3?

A.
71.85 g

B.
143.70 g

C.
159.70 g

D.
319.40 g

Answer 5

C is the correct answer! :)

Answer 6

C

Answer 7

I got B the atomic mass of iron is 55.85 and the atomic mass of oxygen is 15.99, so wouldn't it just be 55.85+55.85+15.99+15.99? That's 143.68 rounded up to 143.7.

Answer 8

oh wait I forgot it is C it was 3O not 2