Molar Mass and % Composition

Aubrey, Aden, and Adelyn are working on a science project about greenhouse gases. They need to calculate the amount of CO₂ produced in their experiment. Can you help them find out the molar mass of CO₂?

• 12.0 g/mol

• 16.0 g/mol

• 32.0 g/mol

• 44.0 g/mol

Ayla, Mattie, and Ilana are studying chemistry and they come across a compound MgF₂. They are trying to figure out the number of atoms in it. Which of their answers is correct?

• Ayla says: Mg : 1--  F :  1
  

• Mattie says: Mg : 1 -- F :  2
  

• Ilana says: Mg :  2 --  F :   1
  

• They all agree on: Mg : 0 -- 

  F : 2

C.J, Morgan, and Rudra are studying chemistry and they come across the compound Mg(NO₃)₂. They are trying to figure out the number of atoms in it. Which list of number of atoms is right?

• Mg : 1--NO :  6
  

• Mg : 1-- N :  6--O:  6
  

• Mg :  1-- N:   1--  O: 5
  

• Mg :  1-- N: 2--  O: 6
  

Jakayla and Brea are working on a chemistry project where they need to calculate the molar mass of table salt (NaCl) used in their experiment. Can you help them figure out the molar mass of NaCl?

• 116.9g/mol

• 35.5 g/mol

• 23.0g/mol

• 58.5g/mol

Jon, Jude, and Cayden are working on a chemistry project where they need to calculate the molar mass of Ba(C₂H₃O₂)₂. Can you help them?

• 255.3 g/mol

• 237.3 g/mol

• 228.3 g/mol

• 196.3 g/mol

Thomas, Ashtyn and Nathan are in a chemistry class. Their teacher explains that the molar mass of an element is equal to its... Can you help them answer?

• Atomic mass

• Atomic number

• Oxidation number

• Valence electrons

Raegan and Kenn are working on a chemistry project where they need to find the molar mass of KCl. Sienna suggested a few options. Can you help them choose the correct one?

• 36 g/mol

• 78.6 g/mol

• 74.6 g/mol

• 178.0 g/mol

Zhiyong and Tyjae are working on a chemistry project where they need to calculate the molar mass of different gases. They are currently trying to find the molar mass of fluorine gas, F₂. Can you help them?

• 18.998 g/mol

• 38 g/mol

• 9 g/mol

• 18 g/mol

How to calculate molar mass of H₂O?

• 2+16=18
• 1+16=17
• 2+32=34
• 1+31=32

Tags

NGSS.MS-PS1-1

How many particles are in a mole?

• 602
• 602 million
• 602 moles
• 6.02 x 10²³