In the same class two students find that a piece of wood with a mass of 70g has a volume of 103 cm3 they conclude the wood is oak is this accurate

The density of oak is ranging from 0.6 - 0.9 g/cm³ and the density of given wood is 0.68 g/cm³ . The piece of wood is oak.

Explanation:

Density:

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

Formula:

D=m/v

D= density

m=mass

V=volume

Symbol:

The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.

Given data:

Volume=  103 cm³

Mass = 70 g

Density = ?

Solution:

d = m/v

d = 70 g/ 103 cm³

d = 0.68 g/cm³

The density of oak is ranging from 0.6 - 0.9 g/cm³. so the piece of wood is oak.

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