The molecular formula for water is H2O. One molecule of water consists of one oxygen atom covalently bonded to two hydrogen atoms.
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Answer:
We need 19.3 mL of HCl
Explanation:
Step 1: Data given
Molarity HCl = 5.00 M
Mass Zn = 3.15 grams
Step 2: The balanced equation
Zn (s) + 2HCl (aq) ⟶ ZnCl2 (aq) + H2 (g)
Step 3: Calculate moles Zn
Moles Zn = mass Zn / molar mass Zn
Moles Zn = 3.15 grams / 65.38 g/mol
Moles Zn = 0.0482 moles
Step 4: Calculate moles HCl needed
For 2 moles HCl we need 1 mol Zn to produce 1 mol ZnCl2 and 1 mol H2
For 0.0482 moles Zn we need 2*0.0482 = 0.0964 moles HCl needed
Step 5: Calculate volume needed
Molarity = moles / volumes
Volumes = moles / molarity
Volume HCl needed = 0.0964 moles HCl /5.00 M
Volume HCl needed = 0.01928 L = 19.3 mL
We need 19.3 mL of HCl
Answer:
The number of neutrons present in one atom of isotope of Silicon of mass 28 amu is<u> 14 neutrons</u>
Explanation:
Symbol of Si isotope
![_{14}^{28}\textrm{Si}](https://tex.z-dn.net/?f=_%7B14%7D%5E%7B28%7D%5Ctextrm%7BSi%7D)
<u>Number of Neutron = Mass number - Atomic Number</u>
Mass number = Total number of protons and neutrons present in the nucleus of the atom.For Si = 28 amu
Atomic Number = Total number of Protons present in the nucleus.
Si = 14
Number of neutron = 24 - 14
= 14
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