Frank has a paper clip. It has a mass of 9g and a volume of 3cm3. What is its density?
A. 1/3 g/cm3
O B. 3 g/cm3
C. 39 g/cm3
D. 27 g/cm3

B. 3 g/cm³

Explanation:

Given data:

Mass of paper clip = 9 g

Volume of paper clip = 3 cm³

Density of paper clip = ?

Solution:

Formula:

d = m/v

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

by putting value,

d = 9 g / 3 cm³

d = 3 g/cm³

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