Answer:
The answer is
<h2>0.4 g/cm³</h2>
Explanation:
The density of a substance can be found by using the formula

From the question
mass of wood = 120 g
volume = 300 cm³
So the density of the wood is

We have the final answer as
<h3>0.4 g/cm³</h3>
Hope this helps you
Acid is 1. a substance that increases the hydrogen ion concentration of a solution
<span>2. removes hydroxide ions because of the tendency for H+ to combine with OH-</span>
Microscope = It enables small things to paper bigger, thus enabling us to understand at a microscopic level, thus improving our understand of HOW it happens
Answer : The volume of oxygen at STP is 112.0665 L
Solution : Given,
The number of moles of
= 5 moles
At STP, the temperature is 273 K and pressure is 1 atm.
Using ideal gas law equation :

where,
P = pressure of gas
V = volume of gas
n = the number of moles
T = temperature of gas
R = gas constant = 0.0821 L atm/mole K (Given)
By rearranging the above ideal gas law equation, we get

Now put all the given values in this expression, we get the value of volume.

Therefore, the volume of oxygen at STP is 112.0665 L
Electrons: negative
Protons: positive
Neutrons: nuetral