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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

Nitrogen dioxide decomposes according to the reaction 2 no2(g) ⇌ 2 no(g) + o2(g) where kp = 4.48 × 10−13 at a certain temperature. if 0.70 atm of no2 is added to a container and allowed to come to equilibrium, what are the equilibrium partial pressures of no(g) and o2(g)