Two Step Chemistry Problems

Grace, Anika, and Samuel are on a science adventure! They stumbled upon a magical water fountain that spews out exactly 821.3 g of water. Can you help them figure out how many water molecules are in that?

• 45.58 molecules

• 8.232 x 10²⁵ molecules

• 8.909 x 10²⁷ molecules

• 2.744 x 10²⁵ molecules

Imagine this, Michael, Avery, and Aria are on a space adventure and they come across a planet made entirely of Zn! They estimate the planet to have about 4.98 x 10²⁴ atoms of Zn. Can you guess the mass of this Zn planet?

• 541 g

• 8.27 g

• .122 g

• 4.59 x 10⁴⁶ g

Tags

NGSS.HS-PS1-7

Benjamin, William, and Hannah are having a science competition! They found a 321.8 g sample of sodium chloride. Can you help them figure out how many moles are in their sample?

• 18810 moles

• 3.315 x 10²⁴ moles

• 5.507 moles

• 4.767 moles

Avery, Aiden, and Maya are having a science competition! They found a 25.69 g sample of calcium chloride. Can you help them figure out how many formula units are in their sample?

• 1.394 x 10²³ F.U.'s

• 2851 F.U.'s

• .2315 F.U.'s

• 3.845 x 10²⁵ F.U.'s

Imagine Kai, Michael, and David are in a chemistry lab. Kai has 86.235 g of diphosphorus pentaoxide and he wants to convert it to moles. Can you help him figure out how many moles he has?

• 12240 moles

• 1.8747 moles

• .608 moles

• .60755 moles

Zoe, William, and Abigail are on a space mission and they stumble upon a planet made entirely of SrCl₂. They estimate that there are about 9.76 x 10²² formula units of SrCl₂ on the planet. Can you help them figure out the mass of SrCl₂ they found?

• .1622 g

• 25.7 g

• 20.0 g

• .3589 g

Tags

NGSS.HS-PS1-7

How many atoms of carbon are in 6.00g of carbon?

• 1.20x10²⁴atoms C
• 6.02x10²³atoms C
• 3.01x10²³atoms C
• 1.50x10²³atoms C

Tags

NGSS.HS-PS1-7

How many grams are in 1.2 x 10²⁴ molecules of CO?

• 28 grams
• 56 grams
• 6.02 grams
• 1.2 grams

Lily, Kai, and Daniel are on a science adventure! They stumbled upon a magical land where they found 3.01 x 10²² atoms of magnesium. Can you help them figure out how many moles this would be?

• 0.05 moles

• 1.81 x 10⁴⁶ moles

• 5.00 x 10²¹ moles

• 5 moles

Arjun, Ethan, and Abigail are having a friendly competition to see who can convert grams to molecules the fastest. How many steps are involved in this conversion process?

• 1

• 2

• 3

• 4