quiz 4 sec 1

number of moles …..

• mass of substances by gram + molar mass

• mass of substances by gram / molar mass

• mass of substances by gram x molar mass

• molar mass / mass of substances by gram

Substances its mass is 80g and number of moles is 2 mole so its molar mass is

• 160g

• 40g

• 100g

• 400g

NO.of mole atoms of Phosporus in vapour state .. .. no of mole atomsofSulpher in the same physical state

• double

• half

• quarter

• third

in the reaction 2Mg + O₂ ------ 2MgO , if the mass of the produced MgO is 80 g so the mass of oxygen which enter reaction is ........ .[Mg=24, 0=16]

• 32g

• 46g

• 64g

• 60g

According to the following reaction 3H₂ + N₂----- 2NH₃ if the mass of reacted hydrogen 30 g so the number of moles of reacted nitrogen is

• 2mol

• 3mol

• 4mol

• 5mol

Substances molar mass = 40 g and number of moles is 2 mol so its mass is

• More than 40 g

• Less than 40 g

• Less than 2g

• 10 g

According the following reacton 2X₂ + Y₂ …….2X₂Y IF 36 MOL OF GAS X₂ reacted with amount of Y₂ gas so number of moles of gas produced from recaction …….mol

• 18 mol

• 36 mol

• 9 mol

• 10 mol

if the molar mass of hydrated cupper sulphate CuSo₄ ,, XH2O equal 249.5 g so X value will equal [Cu=63.5 , 0=16 , H=1]

• 3

• 4

• 5

• 6

which of the following apply on neutralization reaction ..

• produce acid and base

• produce acid and water

• all of them expressed by formula ions

• reaction of acid and water

the largest molar mass of the following is ....

• mole of sulphur in vapor state

• mole of sulphur in solid state

• mole of phosphorous in vapor state

• mole of phosphorous in solid state