Question

Convert into moles present in 3.8g of hydrogen gas

Answer 1

Answer:

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The number of mole is defined by the ratio of mass or weight of the substance to the molar mass of substance or compound

As Number of moles = Mass of substance/molar mass of substance

As the mass here is 3.8 grams while the number of moles of NaBH4(sodium borohydride) is 37.83g/mol. we are taking the round about value of molar mass as 38 here.

So putting values in formula :

Number of moles of NaBH4= Mass or weight of NaBH4/molar mass of NaBH4

Number of moles of NaBH4= 3.8/38 = 0.1 moles  

So 0.1 moles will be present in 3.8 grams of NaBH4.

Explanation: