Answer:
2
Explanation:
There are some basic laws that guide the combination of elements chemically. These are the law of conservation of mass, law of definite proportion, law of multiple proportion and the law of reciprocal proportion.
For this question, the useful law to use is the law of definite proportion. Here, it is stated that no matter the method of preparation or source of preparation, the elements of a chemical compound are always present in a fixed ratio.
What this means that at any point in time, the compound titanium dioxide contains one atom of titanium and two atoms of oxygen. This means that both atoms are present at all times in a proportion of 1 to 2 .
B- Carbon dioxide, every other option listed is composed of more than one thing.
Answer:
<h2>95.5 moles</h2>
Explanation:
To find the number of moles in a substance given it's number of entities we use the formula
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
We have the final answer as
<h3>95.5 moles to 3 sig. figures</h3>
Hope this helps you
Answer:
Heated copper metal reacts with oxygen to form the black copper oxide. The copper oxide can then react with the hydrogen gas to form the copper metal and water.
Answer:
7.88 g/mL
Explanation:
In order to calculate the density we need the mass and the volume of the metal.
The mass is already given by the problem (256.0 g). As for the volume, we can calculate it using <em>Archimede's principle</em>: The volume of water the metal displaced is equal to the volume of the metal.
- Volume of Water displaced = 87.3 mL - 54.8 mL = 32.5 mL
Thus the volume of the metal is 32.5 mL.
- Finally we calculate the density:
- Density = mass / Volume = 256.0 g / 32.5 mL = 7.88 g/mL
