Question

Can someone help, please ??

Chemistry

9. The molecular mass of sodium oxide (Na2O) is
A. 61.97894.
B. 22.98977.
C. 38.98917.
D. 45.97954.

10. A substance that contains hydrogen that may be replaced by a metal is a/an
A. colloid.
B. acid.
C. nonmetal.
D. base

Answer 1

9. all you have to do find the atomic mass of each atom in the periodic table.

Na is 23.0
O= 16.0

molecular mass of Na2O= 2x23.0 + 16.0= 62.0 g/mol

10. this is the description of an acid