The diagram shows the mass spectrum of a sample of chlorine. Peaks $$$\mathrm{V}, \mathrm{W}, \mathrm{X}, \mathrm{Y}$$$ and Z are labelled. Which statements about this spectrum are correct? 1 The relative atomic mass of chlorine can be calculated from the abundances and $$$\mathrm{m} / \mathrm{e}$$$ values of 2 of the 5 peaks. $$$2 \quad 37.0 \mathrm{~g}$$$ of the species responsible for peak Z contains $$$3.011 \times 10^{23}$$$ molecules. 3 The relative molecular mass of chlorine can be calculated from the abundances and $$$m / e$$$ values of peaks $$$X, Y$$$ and $$$Z$$$.

1, 2 and 3

1 and 2 only

1 and 3 only

2 and 3 only

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_w24_qp_11 Year：2024 Question No：40

Answer:

11.2.1 describe the relative reactivity of the elements as oxidising agents

11.2.2 describe the reactions of the elements with hydrogen and explain their relative reactivity in these reactions

11.2.3 describe the relative thermal stabilities of the hydrogen halides and explain these in terms of bond strengths

22.2.1 analyse mass spectra in terms of m/e values and isotopic abundances (knowledge of the working of the mass spectrometer is not required)

22.2.2 calculate the relative atomic mass of an element given the relative abundances of its isotopes, or its mass spectrum

22.2.3 deduce the molecular mass of an organic molecule from the molecular ion peak in a mass spectrum

22.2.4 suggest the identity of molecules formed by simple fragmentation in a given mass spectrum

22.2.5 deduce the number of carbon atoms, n, in a compound using the M +1 peak and the formula

22.2.6 deduce the presence of bromine and chlorine atoms in a compound using the M +2 peak