Avogadro number
Avogadro number is a Science & Technology concept from the MPSC syllabus, tested in 5 past MPSC questions (2019, 2021, 2022). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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Real questions that test this
'1 मोल' ही किंमत पुढील कोणत्या किमतीशी समप्रमाणात आहे ? / 1 mole is equal to which quantity from the following?
(a)12 ग्रॅम वजनातील C-12 चे अणू / 12 grams of C-12 atoms
(b)6.022137 × 10²³ अणू (कोणत्याही पदार्थाचे) / 6.022137 × 10²³ atoms (of any material)
(c)555.85 ग्रॅम वजनाचे Fe / 555.85 grams of Fe
(d)1 cm³ आकारमानात बसणारे कोणत्याही पदार्थाचे एकूण अणू / atoms of any material in a volume of 1 cm³
One mole of a substance contains Avogadro's number of particles (6.022 × 10²³) and has a mass equal to its atomic/molecular mass in grams (e.g., 12g of C-12).
अव्होगाड्रो संख्या ही पुढीलपैकी गोष्टींशी संबंधित असते / The Avogadro number is related to
Avogadro's number represents the total number of constituent particles (atoms or molecules) present in exactly 1 mole of any substance.
10 ग्रॅम वायुरूप हायड्रोजनमध्ये H₂, मानक दाब आणि तापमानात हायड्रोजनचे _________ मोल असतात. 10 g of gaseous hydrogen H₂, at NTP/STP contain _________ mol of hydrogen.
Number of moles is calculated as given mass divided by molar mass. Molar mass of H2 is 2 g/mol. So, 10 g / 2 g/mol = 5 moles.
यामध्ये सगळयात जास्त रेणू असतील. [H = 1, C = 12, O = 16, I = 127] The maximum number of molecules are present in _______ [H = 1, C = 12, O = 16, I = 127]
To find the maximum number of molecules, calculate the number of moles for each given option by dividing the given mass by its molar mass, then multiply by Avogadro's number. The substance with the highest moles will have the maximum molecules.