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Answer:</h3>
All atoms of the same element have the same number of protons
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Explanation:</h3>
- Atoms are the smallest particles of elements that can take part in a chemical reaction.
- Atoms of an element have the same number of protons but may have a different number of electrons or neutrons.
- Atoms of the same element with different neutrons are called isotopes.
- An element may have two or more isotopes. For example, oxygen isotopes; oxygen-16, oxygen-17 and oxygen-18.
- Atoms may have a different number of electrons when they lose or gain an electron(s) to attain a stable configuration.
Molecular weight of vanillin = 152 g/mol
Futher molecular formula of vanillin is C8H8O3
Atomic weight of oxygen = 16 g/mol
Thus, 152 g of vanillin contains 16 g of oxygen
∴ 0.045 g (45 mg) of vanillin contains
= 0.00473 g
Also, number of moles of vanillin in 0.045 g sample =
Now, 1 mole = 6.023 X 10^23 molecules
∴ 2.96 X 10^-4 mole = 1.78 X 10^20 molecules
From molecular formula, it can be seen that 1 molecule of vanallin contain 3 atoms of oxygen
∴1.78 X 10^20 molecules contain 3 X 1.78 X 10^20 = 5.34 X 10^20 oxygen atoms
The math is set up like
35.6 ml * 2.7 g/ 1 ml
which will leave you with
96.12 g
Nitrogen dioxide is a toxic gas and therefore it is important for a person handling the gas not to inhale these fumes. Also one needs to protect their eyes while working with the gas.
Therefore following safety precautions should be taken to protect against the hazards of nitrogen dioxide
1) One should wear safety goggles to prevent the fumes from entering into the eyes.
2) Protective mask is needed to prevent the inhalation of the fumes.
Concentrated acid can cause burns if it comes in contact with the skin. It may damage the cloths as well. often times concentrated acids emit toxic fumes. Therefore following safety precautions are needed while handling concentrated acid.
1) One should wear safety gloves to prevent the acid from coming in contact with the skin
2) One should wear protective masks to protect themselves from the fumes.
3) One should also wear protective apron to prevent the damage to the cloths.