Answer:
<h2>The answer is 4.0 g/mL</h2>
Explanation:
The density of a substance can be found by using the formula

From the question
mass = 40 g
volume = 10 mL
The density of the object is

We have the final answer as
<h3>4.0 g/mL</h3>
Hope this helps you
E since its a physical model i.e. you can touch and feel the model :)
Natural gas is nonrenewable, once its used you have to get more, after its all used up you cant use it no more.
The answer is
CH4 + 2 O2 --> CO2 + 2 H20