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BITSAT 2012
Exam
BITSAT
Year
2012
Subject
Chemistry
Chapter
Some Basic Concepts of Chemistry

BITSAT 2012 · Chemistry · Some Basic Concepts of Chemistry

Number of atoms of He in 100 amu of He(atomic wt. of He is 4) are:

Number of atoms of He in 100 amu of He(atomic wt. of He is 4) are:

Options

  1. A25
  2. B100
  3. C50
  4. D100×6×10−23100 \times 6 \times 10^{-23}

Correct answer

A. 25

Step-by-step solution

100 amu of He =1004 atoms of He =25 atoms. \begin{array}{l} 100 \text{ amu of He }=\frac{100}{4} \text{ atoms of He } \\ =25 \text{ atoms. } \end{array}[1a.m.u.=massofoneproton(approx.)]a.m.u. = mass of one proton (approx.)]
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