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SingaporeCombined ScienceQuick questions
Chemistry: Atoms, Bonding and the Mole
Quick questions on The mole and stoichiometry explained: O-Level Combined Science
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the mole?Show answer
A mole is the amount of substance that contains the same number of particles as there are atoms in of carbon-12. That number, the Avogadro constant, is particles per mole. The key point for calculations is that one mole of any substance has a mass in grams equal to its relative atomic or molecular mass.
What is the moles equation?Show answer
The link between mass, moles and relative mass is:
What are reacting masses from equations?Show answer
A balanced equation gives the ratio in which substances react and form, in moles. The routine for a reacting-mass problem is:
What is q1?Show answer
Define the term mole. [2 marks]
What is q2?Show answer
Calculate the relative molecular mass of carbon dioxide, . (: C , O .) [2 marks]
What is q3?Show answer
How many moles are there in of methane, ? (.) [2 marks]
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