Moles, Mass, Molarity

What is the Molar Mass of Potassium Sulfide?

• 110.262 g/mol

• 71.164 g/mol

• 174.258 g/mol

• 158.259 g/mol

What is the Molar Mass of Calcium Carbonate?

• 140.164 g/mol

• 200.172 g/mol

• 100.086 g/mol

• 68.088 g/mol

What is the Molar Mass of Ba(NO₃)₂?

• 350.667 g/mol

• 237.408 g/mol

• 167.334 g/mol

• 229.338 g/mol

What is the Molar Mass of H₂SO₄?

• 98.078 g/mol

• 49.073 g/mol

• 50.081 g/mcol

• 82.079 g/mol

If you had the following cations & anions, what are possible reactants? (SELECT ALL POSSIBLE ANSWERS)

Ca⁺² and Fe⁺³ & Cl^-1 and SO₄^-2

• Ca₃Fe₂ & C_l2SO₄

• CaCl₂ & Fe₂(SO₄)₃

• FeCl₃ & CaSO₄

• Cl₂Ca & (SO₄)3Fe₂

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

_Na₃PO₄₊_KOH   --->
_NaOH + _ K₃PO₄

• 1 Na₃PO₄+3 KOH
  --->
  3 NaOH +  1 K₃PO₄
• 2 Na₃PO₄+2 KOH
  --->
  3 NaOH +  1 K₃PO₄
• 1 Na₃PO₄+2 KOH
  --->
  2 NaOH +  1 K₃PO₄
• 3 Na₃PO₄+3 KOH
  --->
  3 NaOH +  1 K₃PO₄

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

_BaS + _PtF₂ 
                   --->  _BaF₂ + _PtS

• 1 BaS + 1 PtF₂ 
  --->
   1 BaF₂ + 1 PtS
• 4 BaS + 2 PtF₂ 
  --->
   1 BaF₂ +  1 PtS
• 1 BaS + 2 PtF₂ 
  --->
   2 BaF₂ +  2 PtS
• 1 BaS + 3 PtF₂ 
  --->
   1 BaF₂ +  2 PtS

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

Which coefficients balance this equation:
NH₃  +  O₂ ---->   NO  + H₂O

• 2,3,5,6
• 5,5,4,6
• 4,6,4,5
• 4,5,4,6

Tags

NGSS.HS-PS1-7

How many grams are there in 4 moles of H₂O?

• 64

• 38

• 72

How many mole are there in 51 grams of NH₃?

• 1 mole

• 2 moles

• 3 moles

• 2.5 moles