B) energy is absorbed by the reaction
is right answer.
8 protons in oxygen bc it has an atomic number of 8
<h3>
Answer:</h3>
= 5.79 × 10^19 molecules
<h3>
Explanation:</h3>
The molar mass of the compound is 312 g/mol
Mass of the compound is 30.0 mg equivalent to 0.030 g (1 g = 1000 mg)
We are required to calculate the number of molecules present
We will use the following steps;
<h3>Step 1: Calculate the number of moles of the compound </h3>

Therefore;
Moles of the compound will be;

= 9.615 × 10⁻5 mole
<h3>Step 2: Calculate the number of molecules present </h3>
Using the Avogadro's constant, 6.022 × 10^23
1 mole of a compound contains 6.022 × 10^23 molecules
Therefore;
9.615 × 10⁻5 moles of the compound will have ;
= 9.615 × 10⁻5 moles × 6.022 × 10^23 molecules
= 5.79 × 10^19 molecules
Therefore the compound contains 5.79 × 10^19 molecules
Answer:
the chemical equation is balanced ❤
Answer:
Mass = 108 g
Explanation:
Given data:
Mass of water produced = ?
Number of moles of hydrogen = 6.00 mol
Solution:
Chemical equation:
2H₂ + O₂ → 2H₂O
Now we will compare the moles of hydrogen with water.
H₂ : H₂O
2 : 2
6 : 6
Mass of water:
Mass = number of moles × molar mass
Mass = 6 mol × 18 g/mol
Mass = 108 g