quiz 5 - 1 sec

      According to Avogadro’s law, which of the following are directly proportional to each other at constant temperature and pressure?

• (a) Gas pressure and volume

• (b) Temperature and volume

• (c) Solubility and pressure

• (d) Gas volume and number of moles

         According to Avogadro’s law, what happens to the volume a gas occupies if the number of moles increases?

           

       

•   (a) It stays the same.      

• (b) It increases.

• (c) It decreases.

Which of the following statements best describes molar volume?

• (a) The volume that 1 gram of gas takes up

• (b) The volume that 1 atm of gas takes up

• (c) The volume that 1 liter of gas takes up

• (d) The volume that 1 mole of gas takes up

             What is the number of moles of nitrogen gas which react with 18 g of magnesium to form magnesium nitride compound?                                                     [Mg =24, N=14]

• (a)     0.25 mol

• (b)    0.5 mol

• (c)     1 mol

• (d)    2 mol

1.              Which of these samples contains higher number of moles of carbon atoms?

[C=12, H=1, O=16]

خلي بالك ي ناصح عشان انا مغير الارقام

• (a) 12 g of C₄H₁₀

• (b)   13 g of C₂H₅OH

• (c)   66 g of CO₂

• (d)  10 g of C₆H₁₂O₆

.    What is the formula for iron (II) chloride?

                                                         

• (a) FeCl  

• (b) FeCl₂

•    (c) Fe₃Cl 

• (d) FeCl₃

   A mole of potassium Nitrate contains ________

• (a)  1 mol K atom

• (b)   4 mol N atom

• (c) 5 mol O atom

• (d)   1 mol Cr atom

The ratio between the molar mass of the solid sulphur to that of sulphur in its vapour state is _______.

• 1:8

• 1:4

• 1:2

• 1:1

1.              What is the molar mass of barium sulphate?            [Ba = 137, S=32, O= 16]

• (a)            217 g/mol

• (b)            233 g/mol

• (c)            354 g/mol

• (d)            514 g/mol

When 14 g of CO gas react with excess of oxygen, the volume of CO₂ gas which is produced (at STP) equals …..

• (a)            89.6 L

• (b)            11.2 L

• (c)            44.8 L

• (d)            22.4 L