Stoichiometry # 7- Study Guide

Andrea draws a model to represent the chemical reaction between two gases: methane (CH4) and oxygen (O2).

Select the correct responses to satisfy the Law of Conservation of Mass.

I would draw one more _______?________ molecule to the products.

• methane (CH4)

• oxygen (O2)

• carbon dioxide (CO2)

• water (H2O)

Tags

NGSS.HS-PS1-7

Andrea draws a model to represent the chemical reaction between two gases: methane (CH4) and oxygen (O2).

Select the correct responses to satisfy the Law of Conservation of Mass.

By adding this molecule to the products, the reactants and products will have ______? (here)____ carbon atom(s), _______ hydrogen atom(s), and _______ oxygen atom(s) on each side.

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-7

By adding this molecule to the products, the reactants and products will have ________ carbon atom(s), ____? (here)____ hydrogen atom(s), and _______ oxygen atom(s) on each side.

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-7

Andrea draws a model to represent the chemical reaction between two gases: methane (CH4) and oxygen (O2).

Select the correct responses to satisfy the Law of Conservation of Mass.

By adding this molecule to the products, the reactants and products will have ______ carbon atom(s), ______ hydrogen atom(s), and ___? (here)___ oxygen atom(s) on each side.

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-7

Select the number of atoms in one mole of sodium (Na).

• 23

• 22.4

• 6.02 x 10²³

• 12.04 x 10²³

What is the molar mass of helium (He)?

• 2.08 g/mol

• 4.00 g/mol

• 8.00 g/mol

• 1.01 g/mol

Calculate the molar mass of sulfuric acid (H₂SO₄).

• 98.08 g/mol

• 194.30 g/mol

• 97.07 g/mol

• 49.08 g/mol

Calculate the molar mass of sodium fluoride (NaF).

• 23.00 g/mol

• 19.00 g/mol

• 41.99 g/mol

• 9.08 g/mol

Calculate the number of moles of chlorine gas (Cl₂) contained in 9.03x10²³ molecules.

• 1.5 moles

• 6 moles

• 0.75 moles

• 15 moles

Calculate the mass of 0.200 mol of calcium (Ca).

• 26.0 g Ca

• 8.02 g Ca

• 6 moles Ca

• 200.4 g Ca