how much heat, in calories, is needed to raise the temperature of 125.0 g of lead (Clead=0.130J/gC) from 17.5C to 41.1C?

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture