Tungsten metal is reacted with carbon to produce tungsten carbide, an extremely hard compound used to make drills and saw blades. How many moles of tungsten carbide will be
produced if plenty of tungsten is reacted with 1.25 moles of carbon?

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

if you mean hydrogen and oxygen then water is the product

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