TEST SKI3013

What is the mass of 5.2 moles of NH₃ gas?

Given RMM : NH₃ = 17g/mol

• 85.4g

• 88.4g

• 89.4g

• 87.4g

Give one example of a metal and one example of a non-metal.

• Copper (Cu), Bromine (Br₂)

• Bromine (Br₂), Oxygen (O₂)

• Zinc (Zn), Sodium (Na)

• Copper (Cu), Natrium (Na)

What is the Relative Formula Mass of Hydrochloric Acid, HCl?

Given RAM : H = 1 ; Cl = 35.5

• 37.0

• 37.5

• 36.0

• 36.5

Give the molecular formula and relative molecular mass of water.

• MF = H₂ ,

  RMM = 16

• MF = H₂O ,

  RMM = 18

• MF = HO₂ ,

  RMM = 16

• MF = HO ,

  RMM = 18

Answer explanation

What does Avogadro's constant mean?

• Number of particles in a substance

• The number of ionic compounds in a substance

• The number of particles in one mole of a substance

• Number of elements in one mole.

What number is called Avogadro's

constant or Avogadro's number (N_A) ?

• 6.022 × 10²²

• 6.022 × 10²³

• 6.022 × 10²⁴

• 6.022 × 10²⁵

Molar mass is mass of one ____ of substance.

What is the unit of molar mass?

• atoms

• mol

• g/mol

• dm³

Value of molar mass of a subtance is the same as its relative mass.

Is it true or false?

• True

• False

A substance has a molar mass of 18 g/mol.

If 36 grams are used, how many moles are present?

• 1.50 mol

• 2.00 mol

• 1.00 mol

• 2.16 mol