(Solved): question 5,6,7 SECTION B What follows is a scientific article broken up into sections. At the end of ...

SECTION B What follows is a scientific article broken up into sections. At the end of each headed section there are questions on that section of the article. Read each section of the article carefully and answer all the questions given, taking care to write in full sentences unless a calculation is asked for, in which case all working out should be shown to get full credit. Light-emitting diodes and carbon-neutral energy Introduction The effective use of carbon-neutral energy relies on the operation of energy- saving light-emitting electric elements, such as the light-emitting diodes (LEDs). The work of a LED is based on a chemical Al Ga In P called aluminium gallium indium phosphide Each molecule of the chemical comprises of one aluminium atom, one gallium atom, one indium atom and one atom of phosphorus. Using the periodic table 5. What is the molar mass of Al Ga In P? [3 marks] 6. Calculate the mass of a single Al Ga In P molecule. [2 marks] 7. Calculate the number of moles in 48.6 grams of the Al Ga In P substance. [1 mark]