stochiometry

What id the molar mass of UF₆?

• 101 g/mol

• 238 g/mol

• 257 g/mol

• 352 g/mol

Calculate the molar mass of KOH.

• 28 g/mol

• 56 g/mol

• 84 g/mol

• 112 g/mol

Calculate the molar mass of Cu₂O.

• 37 g/mol

• 45 g/mol

• 79.5 g/mol

• 143 g/mol

Consider the equation CaCl₂ + 2Na --> 2NaCl + Ca. How many moles of NaCl can be produced from 8 moles of CaCl₂?

• 8

• 4

• 16

• 2

Tags

NGSS.HS-PS1-7

Consider the equation CaCl₂ + 2Na --> 2NaCl + Ca. How many moles of NaCl can be produced from 5 moles of Na?

• 2.5

• 5

• 2

• 10

For the Balanced Reaction:
3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe;
What is the Ratio of moles of Mg to moles Fe?

• 3mol Mg / 2 mol Fe
• 2 mol Mg/ 3 mol Fe
• 1 mol Fe/ 2 mol Fe
• 3 mol MgO / 2 mol Fe

Tags

NGSS.HS-PS1-7

Select the coefficients that correctly balance the following skeleton equation:

__ N₂ + __ H₂ --> __ NH₃

• 2, 6 --> 4

• 3, 1 --> 2

• 6, 2 --> 4

• 1, 3 --> 2

Tags

NGSS.MS-PS1-5

Bornite, Cu₃FeS₃, is a copper ore used in the production of copper. When heated, the following reaction occurs:

2 Cu₃FeS₃(s) + 7 O₂(g) --> 6 Cu(s) + 2 FeO(s) + 6 SO₂(g)

What is the mole ratio of iron (II) oxide to sulfur dioxide?

• 2:7

• 2:6

• 6:2

• 7:2

2NaClO₃ (s) → 2NaCl (s) + 3O₂ (g)  
12.00 moles of NaClO₃ will produce how many grams of O₂?

• 256 g of O₂
• 576 g of O₂
• 288 g O₂
• 144 g O₂

Cl₂ + 2KBr → Br₂ + 2KCl
How many grams of potassium chloride (KCl) can be produced from 356 g of potassium bromide (KBr)?

• 749 g
• 223 g
• 479 g
• 814 g

Tags

NGSS.HS-PS1-7