Question

What is the molar mass of hemocyanin?

Answer 1

Nominally, 75000 daltons `(g/"mol")`, and up to 390,000.

Explanation:

It is a respiratory protein, similar to hemoglobin, but centered around copper instead of iron. As a protein, it it usually measured in Daltons, not molecular weight.

https://biosyncorp.com/klh/introduction_to_hemocyanins/
http://www.jbc.org/content/251/23/7644.full.pdf

Molecular masses of proteins are often expressed in daltons. For example, a molecule of a protein with molar mass 64000 g⋅mol−1 has a mass of 64 kDa. - Berg, Jeremy M.; Tymoczko, John L.; Stryer, Lubert (2007). "2". Biochemistry (6th ed.). New York: Freeman. p. 35. ISBN 978-0-7167-8724-2.

https://en.wikipedia.org/wiki/Unified_atomic_mass_unit