<span>We know that density is equal to mass divide by volume of the material D=M/V. So then, in our case the material has a density of 8.9 gr/cm3 and the volume is 6 cm3. The mass will be M=D*V => 8.9 * 6 = 53.4 grams of substance.</span>
Answer:
To neutralize nitric acid we will need a base which is ammonia.
Explanation:
Neutralization reaction is defined as the chemical reaction in which an acid reacts with a base to produce a salt and water molecule.
The chemical equation for neutralization reaction follows:

So, in order to neutralize nitric acid we will need a base which is ammonia.

As we know that ammonia is Bronsted lowry base which can accept proton. So, ammonia will accept the proton given by nitric acid to form ammonium ion.And this ammonium ion formed carries positive charge which combine with nitrate ion to form ammonium nitrate as a product.
Answer:
Neon and Methane
Explanation:
Nitrogen and Oxygen made up way over half of the atmosphere so it's without a doubt, not those two. Precisely, Nitrogen makes up 78% of the atmosphere while oxygen makes up 21%
If the buret is dirty, it will react with the NaOH in the buret and will cause your concentration to be off.