Significant figures are numbers that are not 0s, but they are included if they are between two numbers:
There are three significant figures, 304
Hope this helps! :)
Given that acids burns and the reactions of some metals with acids are violent, you have to protect agains spills and splashes that can seriously harm you: your eyes, your hands, your arms, your feet, even your clothe.
So you shall use:
- Safety glasses (googles)
- Chemical gloves
- Lab coat
- Closed shoes
Answer:
The number of electrons is the atomic number
Answer:
9.1747x10⁻²⁵g
Explanation:
The mass defect is the difference between the mass of a nucleus and the mass of its particles. The nucleus is formed by protons and neutrons. The atomic number of Cobalt is 27, which means that it has 27 protons in its nucleus. The number of neutrons is the mass (60) less than the number of protons, so it is 33.
Then:
Mass of 27 protons = 27 x 1.00728 = 27.19656 amu
Mass of 33 neutrons = 33 x 1.00867 = 33.28611 amu
Total mass = 60.48267 amu
Mass defect = 60.48267 - 59.9338
Mass defect = 0.54887 amu
1 amu = 1.66054x10⁻²⁴ g, so 0.54887 amu = 9.1747x10⁻²⁵g
False, they are two different things lol
