The answer is include quartzite and marble bc the are classified based primarily on their composition
<u>Answer:</u> In accordance to Avogadro's law, two liters of hydrogen gas and one liter of oxygen gas react to form two liters of water.
<u>Explanation:</u>
The relationship of number of moles and volume at constant temperature and pressure was given by Avogadro's law. This law states that volume is directly proportional to number of moles at constant temperature and pressure.
Mathematically,
(at constant pressure and temperature)
The chemical equation for the formation of water molecule follows:

The mole ratio of
is 2 : 1 : 2
The volume ratio of
will also be 2 : 1 : 2
We are given:
Volume of hydrogen gas = 2 L
Volume of oxygen gas = 1 L
Volume of water = 2 L
So, the volume ratio of
is 2 : 1 : 2
Hence, in accordance to Avogadro's law, two liters of hydrogen gas and one liter of oxygen gas react to form two liters of water.
Answer:
b. 760 g
Explanation:
The mass of the solution = 800 g
5% of NaCl by mass of the solution can be determined as follows;
5% of 800 =
× 800
= 5 × 8
= 40 g
The mass of NaCl in the solution is 40 g.
The mass of water = mass of solution - mass of NaCl
= 800 - 40
= 760 g
Therefore, the mass of water required is 760 g.
That is called the<u> variable</u> because it varies/changes in the experiment,
it's like x in algebra (with more than one placeholder), if it changes, it normally gives you a different result