Mole concept

A student needs 65.0 g of copper(II) chloride, CuCl2, for an experiment. How many atoms of copper are there in this sample?

Seorang pelajar memerlukan 65.0 g kuprum(II) klorida, CuCl2, dalam satu eksperimen yang dijalankan. Berapakah  atom kuprum di dalam sampel  ini?

[Relative atomic mass/ Jisim atom relatif Cu, 64, Cl, 35.5;  NA = 6.02 x 10 ^23 mol-1]

• 2.91 x 10^23 atoms

• 3.91 x 10^25 atoms

• 2.35 x 10^23 atoms

• 4.70 x 10^23 atoms

If one Monster energy drink contains 0.16 g of caffeine, how many moles of caffeine do we consume when we drink 1 can? The chemical formula for caffeine is C₈H₁₀N₄O₂.

Dalam satu tin minuman 'Monster energy' mengandungi 0.16 g kafein. Berapakah bilangan mole kafein yang kita peroleh apabila kita minium satu tin minuman tersebut. Formula kimia bagi kafein adalah C₈H₁₀N₄O₂

_{[Relative atomic mass/ Jisim atom relatif: C, 12; H, 1; N, 14; O,16]}

• 194.19 moles

• 1.07 moles

• 0.00082 moles

• 1213.69 moles

Mylanta, a common antacid, contains magnesium hydroxide, Mg(OH)₂. How many moles of magnesium hydroxide are in 75.0 g of magnesium hydroxide?

Mylanta merupakan satu jenis antasid yang mengandungi Mg(OH)₂. Berapakah bilangan mol magnesium hydroksida bagi 75.0 g m sampel ini?

[Relative atomic mass/ Jiism atom relatif: H, 1;Mg, 24; ), 16]

• 0.551 moles

• 0.778 moles

• 1.29 moles

• 1.82 moles

Which of the following has the most number of atoms?

Antara berikut, yang manakah mengandungi bilangan atom yang paling banyak?

[NA = 6.02 x 10^23 mol-1]

• 1.5 moles of oxygen, O2

  1.5 mol oksigen, O2

• 1.0 mol of ammonia, NH3

  1.0 mol ammonia, NH3

• 0.5 moles of sulpur dioxide, SO2

  0.5 mol sulfur dioksida, SO2

• 1.2 moles of carbon dioxide, CO2

  1.2 mol karbon dioksida, CO2

What is the mass of nitrogen in 20.0 g of ammonium nitrate, NH4NO3?

Berapakah jisim nitrogen dalam 20.0 g ammonium nitrat, NH4NO3?

[Relative atomic mass / Jisim atom relatif: H, 1; N, 14; O, 16]

• 3.5 g

• 7.0 g

• 14.0 g

• 56.0 g

What is the mass of carbon dioxide that contains the same volume as in 2 moles of sulphur dioxide?

Berapakah jisim karbon dioksida yang mengandungi isi padu yang sama banyak dengan 2 mol sulfur dioksida?

[ Relative atomic mass/ Jisim atom relatif: C,12; O, 16; S, 32]

• 44

• 64

• 88

• 128

The formulae of barium carbonate and ammonium phosphate are BaCO3 and (NH4)3PO4 respectively. What is the formula of barium phosphate?

Formula bagi barium karbonat dan ammonium fosfat adalah BaCO3 dan (NH4)3PO4 masing-masing. Apakah formula bagi barium fosfat?

• BaPO4

• Ba2PO4

• Ba(PO4)2

• Ba3(PO4)2

The formula for X oxide is X2CO3 and its relative formula mass is 106. What is the relative atomic mass of element X?

Formula bagi oksida X ialah X2CO3, jisim formula relatif baginya ialah 106. Berapakah jisim atom relatif bagi unsur X?

relative atomic mass/ Jisim atom relatif: C, 12; O, 16]

• 23

• 30

• 46

• 60

10.5 g of the oxide of metal M with the empirical formula of MO produces 7.5 g of M when it is reduced completely. What is the relative atomic mass of M?

10.5 g okida logam M dengan formula empirik MO menghasilkan 7.5 g M apabila diturunkan dengan lengkap. Berapakah jsisim atom relatif M?

[Relative atomic mass/ Jisim atom relatif: O = 16]

• 5

• 11

• 14

• 40

1.6 g of gas X occupies 560 cm3 at standard temperature and pressure ( s.t.p). What is the relative molecular mass of X?

1.6 g gas X menempati 560 cm3 pada suhu dan tekanan piawai ( stp). Berapakah jisim molekul telatif bagi X?

[molar volume of gas at s.t.p/ Isi padu molar gas pada s.t.p = 22.4 dm3 mol-1]

• 4

• 16

• 32

• 64