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Hitunglah berapa gram massa zat berikut: a. 4 mol (Ar = 1, =16, = 23) b. 2,5 mol (Ar = 56)

Hitunglah berapa gram massa zat berikut:

a. 4 mol begin mathsize 14px style Na O H end style (Ar begin mathsize 14px style H end style = 1, begin mathsize 14px style O end style=16, begin mathsize 14px style Na end style= 23)

b. 2,5 mol begin mathsize 14px style Fe end style (Ar begin mathsize 14px style Fe end style = 56)space

Jawaban:

Mol adalah satuan dasar SI yang mengukur jumlah zat. Hubungan antara mol dengan massa zat dirumuskan:

begin mathsize 14px style mol equals fraction numerator massa space zat over denominator Ar end fraction space atau space mol equals fraction numerator massa space zat over denominator Mr end fraction end style  

Untuk menghitung massa zat berikut menggunakan rumus di atas,

begin mathsize 14px style a right parenthesis space mol equals fraction numerator massa space Na O H over denominator Mr end fraction space space space space Mr space Na O H equals 1 cross times Ar space Na plus 1 cross times Ar space O plus 1 cross times H space space space space space space space space space space space space space space space space space space equals 1 cross times 23 plus 1 cross times 16 plus 1 cross times 1 space space space space space space space space space space space space space space space space space space equals 40 space space space space massa space Na O H double bond mol cross times Mr space space space space space space space space space space space space space space space space space space space space space space space space space equals 4 cross times 40 space space space space space space space space space space space space space space space space space space space space space space space space space equals 160 space gram end style 

begin mathsize 14px style b right parenthesis space mol equals fraction numerator massa space Fe over denominator Ar end fraction space space space space massa space Fe double bond mol cross times Ar space space space space space space space space space space space space space space space space space space space equals 2 comma 5 cross times 56 space space space space space space space space space space space space space space space space space space space equals 140 space gram end style  

Maka, massa yang dihasilkan pada NaOH = 160 gram, dan massa Fe = 140 gram.space

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