A solid object is 75.5 g in mass and has a volume of 13.25 cm^3. What is its density?

5,7 g/cm³

d = m/V

= 75.5g/13.25cm³

≈ 5,7 g/cm³

if you're asking what comes out, it's steam.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.