<h3>
Answer:</h3>
Different mass, same atomic number
<h3>
Explanation:</h3>
- Elements are made of similar atoms, however the atoms may have different number of neutrons but the same number of protons in their nucleus.
- Such atoms that have equal number of protons but different number of neutrons are known as isotopes.
- Difference in the number of neutrons makes isotopes to have different mass numbers.
- Atomic number is the number of protons in the nucleus of an atom, therefore, isotopes have the same atomic number.
Answer:
5.3%
Explanation:
Let the volume be 1 L
volume , V = 1 L
use:
number of mol,
n = Molarity * Volume
= 0.8846*1
= 0.8846 mol
Molar mass of CH3COOH,
MM = 2*MM(C) + 4*MM(H) + 2*MM(O)
= 2*12.01 + 4*1.008 + 2*16.0
= 60.052 g/mol
use:
mass of CH3COOH,
m = number of mol * molar mass
= 0.8846 mol * 60.05 g/mol
= 53.12 g
volume of solution = 1 L = 1000 mL
density of solution = 1.00 g/mL
Use:
mass of solution = density * volume
= 1.00 g/mL * 1000 mL
= 1000 g
Now use:
mass % of acetic acid = mass of acetic acid * 100 / mass of solution
= 53.12 * 100 / 1000
= 5.312 %
≅ 5.3%
The are eight hydrogen atoms in ammonium sulfide because there are 2 molecules of ammonium.
Moles oxygen = 0.0338 x 11 =0.372
atoms oxygen = 0.372 x 6.02 x 10^23=2.24 x 10^23
<span>
moles water = 7 x 0.0338 =0.237
</span>
Aluminum has a chemical formula of Al, while diatomic bromine has a chemical formula of Br₂. The balanced chemical reaction is shown below:
<em>2 Al (s) + 3 Br₂ (l) → 2 AlBr₃ (s)</em>
The solid product is called Dibromoaluminum. The stoichiometric coefficients are used to balance the reaction to obey the Law of Conservation of Mass.
