How many atoms of hydrogen are present in 10g of methane?

Explanation:

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In this case, since the molecular formula of methane is CH₄, can compute the moles of methane in 10 g first:

Now, since 1 mol of methane contains 4 mol of hydrogen atoms, and 1 mol of any atom contains 6.022x10²³ atoms via the Avogadro's number, we obtain the following number atoms of hydrogen:

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answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-