Chemistry

What is the molar mass of Ca(NO₃)₂?

• 164.03 g/mole
• 228.32 g/mole
• 150.02 g/mole
• 218.05 g/mole

What is the molar mass of B₂(CO₃)₃?

• 81.632 g/mol
• 94.842 g/mol
• 38.822 g/mol
• 201.648 g/mol

How many moles of molecules of F₂ in 18 x 10²³ molecules of F₂ ?

• 18 x 10²³ / 6 x 10²³
• 18 x 10²³ / 2
• 18 x 10²³ x 6 x 10²³

How many liters of gas are there in 44 g of bromine gas at STP?

• 3.5 L
• 10.54 L
• 12.34 L
• 6.17 L

What is the mass of 6.7 moles of H₂O?

• 110 g
• 120 g/mol
• 120 g
• 120 mol

A container with a volume of 893 L contains how many moles of air at STP?

• 20003.2 L
• 39.9 L
• 22.4 L
• none of the choices

Balance this equation:  ___Al₂O₃ ---> ___Al + ___O₂ 

• Cannot be balanced
• 2Al₂O₃ ---> 2Al + 3O₂ 
• 2Al₂O₃ ---> 4Al + 3O₂ 
• 3Al₂O₃ ---> 2Al + O₂ 

Tags

NGSS.HS-PS1-7

Balance this equation:
 __Li + __Cl₂ -> __LiCl

• 2Li + Cl₂ -> 4LiCl₂
• 2Li + Cl₂ -> LiCl₂
• 2Li +  1Cl₂ -> 2LiCl
• Not possible to balance

Tags

NGSS.HS-PS1-7

Use the following equation:
NaIO₃(aq) + 6HI(aq) --> 3I₂(s) + NaI(aq) + 3H₂O(l)
How many moles of I₂ can be made from 6.55 moles of NaIO₃?

• 4.55 moles I₂
• 23.18 moles I₂
• 19.65 moles I₂
• 34.99 moles I₂

Tags

NGSS.HS-PS1-7

A gas at 7700.7 kPa occupies a volume of 768 mL. Calculate the volume at 23 kPa.

• 260000 mL
• 270000 mL
• 250000 mL
• 4257285689 mL