None. To bind with an hydrogem atom, the carbon needs to ''share'' one of it's valence electron's with the hydrogen's valence electron. Therefore, forming 4 bounds means the carbon atom will share it's 4 valence electrons and there will be no lone electrons.
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Answer:
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1.67377x10-27 kilogram(kg) or 1.67377x 10-24 gram(g)