Water , H2O, is a molecule made of oxygen and hydrogen. The bonds that hold water molecules together are due to shared ELECTRONS, and known as covalent bonds
<span><span>4.2×1022</span>NA</span><span> N_{A} is the avagadro number</span>
Reactant are those that combine or reacts to give products !!
so in combustion of ethane ; ethane and o2 are reactants so ... your answer is B !!
The lone pairs and number of bonds to the central atom. ...<span>
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