Answer:
2) total number of protons
Helium has an atomic number of one, and has only one proton in its nucleus.
Oxygen has an atomic number of 8 and an atomic mass of 16. From this we know that the atomic number measures the number of protons, and the atomic mass is the overal sum of protons and neutrons.
Answer:
8.73 × 10²⁴ formula units
Explanation:
To calculate the number of formula units a substance contain, we multiply the number of moles by Avagadro number (6.02 × 10²³)
number of formula units = 14.50 moles × 6.02 × 10²³
= 87.29 × 10²³
= 8.73 × 10²⁴ formula units.
I think the answer would be d.
Answer:
5 % by mass
Explanation:
1. Calculate the <em>moles of KIO₄</em>.
2. Calculate the <em>moles of sugar</em>
3. Calculate the <em>mass of sugar</em>
4. Calculate the <em>mass of the sugar solution</em>
5. Calculate the <em>percent by mass</em> of sugar
<em>Note</em>: The answer can have only one significant figure because that is all you gave for the concentration of KIO₄.
Answer : The correct answer is 109.
Explanation :
Significant figure : It is defined as the each digits of a number have meaning or contribute to the value of the number.
The addition of given digits is,
43.2 + 50.0 + 16.0 = 109.2
As per the question, the given digits has 3 significant figures. But the answer after addition is 109.2 has 4 significant figures.
The addition rule of significant rule is the least precise number of significant figure in any number of the problem determines the number of significant figures in the answer.
Therefore, from the addition rule, the correct answer is 109.
