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LATIHAN PENGUKUHAN FORM4 (PENGIRAAN MOL)

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Published by suriana, 2022-11-08 20:12:41

LATIHAN PENGUKUHAN FORM4 (PENGIRAAN MOL)

LATIHAN PENGUKUHAN FORM4 (PENGIRAAN MOL)

Nama: Kelas: Tarikh:

Selesaikan masalah berikut.

1. 4K + O2 → 2K2O
Find the mass of potassium required to produce 28.2 g of potassium oxide.[RAM K= 39 , O= 16]
Hitungkan jisim kalium yang diperlukan untuk menghasilkan 28.2g kalium oksida [JAR, K=39, O=16]

2. Calculate the mass of zinc required to react with excess hydrochloric acid to produce 6 dm3 of
hydrogen gas at room conditions.
[ RAM Zn= 65 , Cl = 35.5 , 1 mole of gas occupies 24 dm3 at room temperature.]
Hitungkan jisim zink yang diperlukan untuk bertindakbalas dengan asid hidroklorik berlebihan
untuk menghasilkan 6 dm3 gas hidrogen pada keadaan bilik .
[ JAR Zn= 65 , Cl = 35.5 , 1 mol gas menempati 24 dm3 pada keadaan bilik]

3. 16.0 g of copper (II) oxide powder is added to excess dilute nitric acid and heated. Calculate the
mass of copper (II) nitrate produced. [RAM: N=14, O=16, Cu=64]
16.0 g serbuk kuprum(II) oksida ditambah asid nitrik cair berlebihan dan dipanaskan. Hitungkan
jisim kuprum(II) nitrat dihasilkan [JAR N=14, O=16, Cu=64]

4. 10 g of Magnesium oxide is added to hydrochloric acid. Calculate the mass of magnesium chloride
that has produced. [RAM: O=16, Mg=24]
10 g of Magnesium oksida ditambah kepada asid hidroklorik. Hitungkan jisim magnesium klorida
yang terhasil. [JAR O=16, Mg=24]

5. H2O2 → H2O + O2

i. Balance the equation above.
Seimbangkan persamaan di atas.

ii. Calculate the number of moles of H2O2 that decomposes if 11.2 dm3 oxygen gas is collected
at STP. [RAM: H=1, O=16, 1 mole of gas occupies 22.4 dm3 at STP.]
Hitungkan bilangan mol H2O2 yang terurai jika 11.2 dm3 gas oksigen dikumpulkan pada STP
[JAR: : H=1, O=16, 1 mol gas menempati 22.4 dm3 pada stp]

6. In a laboratory, Osman added 0.025mol zinc nitrate solution into a beaker filled with
sodium carbonate solution. A white precipitate, zinc carbonate and sodium nitrate solution
are formed.
Di dalam makmal, Osman menambahkan 0.025mol larutan zink nitrat ke dalam bikar berisi
larutan natrium karbonat. Mendakan putih, zink karbonat dan larutan natrium nitrat
terbentuk.
i. Write the chemical equation for the reaction
Tuliskan persamaan kimia bagi tindak balas yang berlaku.

ii. State information obtained for the reaction in c(i) in term of qualitative aspect and
quantitative aspect.
Nyatakan maklumat yang diperoleh bagi tindak balas di c(i) dari aspek kualitatif dan
kuantitatif.
Qualitative / kualitatif:

Quanitative / kuanitatif:

iii. Calculate the mass of white precipitate, zinc carbonate formed.
[Relative atomic mass: C=12; O=16, Zn=65]
Hitungkan jisim mendakan putih, zink karbonat terbentuk.
[jisim atom relatif: C=12; O=16, Zn=65]


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