S1-Q6- mole molar mass Avogadro's number

How many molecules are in 2.5 mol of NaCl?

• 1.51x10²³

• 146

• 4.15

• 1.5x10²⁴

How many atoms of carbon are in 6.00g of carbon? [C=12]

• 1.20x10²⁴atoms C

• 6.02x10²³atoms C

• 3.01x10²³atoms C

• 1.50x10²³atoms C

What are the units for molar mass?

• grams
• amu
• grams/mole
• liters

What is the mass of 0.89 mol of CaCl₂? [Ca=40 ; Cl=35.5]

• 111 grams

• 0.008 grams

• 98.79 grams

• 124.72 grams

Avogadro’s number is:

• 6.02 x 10²²

• 6

• 6.02 x 10²³

• 3.01 x 10²³

How many water molecules are in 5.2 moles of water?

• 6.0 x 10²³ molecules

• 5.2 molecules

• 3.1 x 10²⁴ molecules

• 8.6 x 10^-24 molecules

Tags

NGSS.HS-PS1-7

What is the mass of 2.50 mol of oxygen gas O₂? [O=16]

• 40 g

• 80 g

• 16 g

• 32 g

How many moles are in 1.0g of NaCl ? [Na=23 ; Cl=35.5]

• 0.181 mole

• 6.0 x 10²³ mole

• 0.50 mole

• 0.017 mole

Select the correct molar ratio taken from this balanced equation:

4 Al + 3 O₂ --> 2 Al₂O₃

• 1 mol Al = 1 mol Al₂O₃

• 4 Al = 2 Al₂O₃

• 4 mol Al = 2 mol Al₂O₃

• 4 mol Al = 2 mol Al

Tags

NGSS.HS-PS1-7

Select the coefficients that correctly balance the following skeleton equation:

__ H₂O --> __ H₂ + __ O₂

• 2 --> 2, 1

• 1 --> 1, 2

• 4 --> 2, 2

• 2 --> 2, 4

Tags

NGSS.HS-PS1-7