Question

A. Two atoms of an element have atomic number 8 and mass numbers 16 and 18. What are such atoms called as? State 1 application of these forms of atoms. B.calculate the concentration of glucose solution which is prepared by dissolving 40g of glucose in 320g of water

Answer 1

a)Those type of atoms are called isotopes.
Isotopes are elements having same atomic number but different mass number.
The element is oxygen and it has 3 isotopes.
All three Oxygen isotopes have medical applications. O-16 is used in the production of radioactive N-13 which is used for PET imaging and myocardial perfusion. O-17 can beused as a tracer in the study of cerebral oxygen utilization. Large quantities of O-18 are used for the production of F-18.
b)concentration of glucose in terms of molarity:
molarity =
$\frac{no \: of \: moles \: of \: solute}{volume \: of \: solvent \: in \: litres}$
no of moles of glucose= 40/180
= 2/9 moles
volume of water = 320 g
= 0.18 litres
molarity = 2/9 × 0.18
= 0.4 M