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Structure of Atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryStructure of Atom3 Marks
Question
Find
  1. The total number and.
  2. The total mass of protons in 34mg of $NH_3$ at $STP.$
Will the answer change if the temperature and pressure are changed?
✓

Answer

1 mol of $NH_3= 17g NH_3= 6.022 \times 10^{23}$ molecules of $NH_3$
1 atom of $NH_3$ contains = 7 + 3 = 10 protons
$\therefore$ The number of protons in 1 mol of $NH_3= 6.022 \times 10^{24}$​​​​​​​ protons.
Number of protons in 34mg of $NH_3​​​​​​​$​​​​​​​ $=\frac{(6.022\times10^{24}\times34)}{17\times1000}=1.2044\times10^{22}\text{ protons.}$
Mass of one proton $= 1.6726 \times 10^{-27}kg$
$\therefore$ Mass of $1.2044 \times 10^{22}$ protons $= (1.6726 \times 10^{-27}) \times (1.2044\times 10^{22})kg = 2.0145 \times 10^{-5}kg.$
No, there will be no effect of temperature and pressure.

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