Chemistry 9th Chap 6 : Test Yourself

Chemistry Chapter 6 : Test Yourself

1 / 7

What is the formula mass of CuSO₄ . 5H₂O. (Atomic masses: Cu=63.5 , S=32 , O=16 , H=1)

A) 159.5

B) 185.5

C) 149.5

D) 249.5

2 / 7

A compound with chemical formula Na₂CX₃ has formula mass 106 amu. Atomic mass of the element X is ________.

A) 16

B) 23

C) 106

D) 12

3 / 7

How many moles of molecules are there in 16 g oxygen?

A) 0.5

B) 0.1

C) 1

D) 0.05

4 / 7

What is the mass of 4 moles of hydrogen gas?

A) 8.064 g

B) 1.008 g

C) 4.032 g

D) 1 g

5 / 7

What is the mass of carbon present in 44 g of carbon dioxide?

A) 6 g

B) 12 g

C) 24 g

D) 44 g

6 / 7

Which term is the same for one mole of oxygen and one mole of water?

A) molecules

B) volume

C) mass

D) atoms

7 / 7

If one mole of carbon contains x atoms, what is the number of atoms contained in 12 g of Mg?

A) 0.5 x

B) 1.5 x

C) x

D) 2x

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