Percent

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NGSS.MS-PS3-1

which one defines percent composition?

• the percent by mass of each element in a compound

• when elements join together

• when water dries up

• elements split

Tags

NGSS.MS-PS1-1

What is the equation for percent composition?

what is the percent composition of CuBr?

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What is the percent composition by mass of sulfur in the compound MgSO₄ (gram formula mass = 120 g/mol)?

• 20%

• 27%

• 46%

• 53%

In which compound is the percent composition by mass of Cl equal to 42%?

• HClO (gram formula mass = 52 g/mol)

• HClO₂ (gram formula mass = 68 g/mol)

• HClO₃ (gram formula mass = 84 g/mol)

• HClO₄ (gram formula mass = 100 g/mol)

What is the percent composition by mass of oxygen in water (H2O)?

• A) 33%

• B) 50%

• C) 67%

• D) 89%

Tags

NGSS.MS-PS1-1

In a chemical reaction, if 20 grams of a compound is made up of 5 grams of hydrogen, what is the percent composition of hydrogen in the compound?

• A) 10%

• B) 20%

• C) 25%

• D) 50%

Tags

NGSS.MS-PS1-1

Which of the following best describes the percent yield in a chemical reaction?

• A) The percent by mass of each element in a compound

• B) The ratio of the actual yield to the theoretical yield, multiplied by 100

• C) The amount of product formed in a reaction

• D) The percent of reactants converted to products

What is the percent composition of carbon in carbon dioxide (CO2)?

• A) 12%

• B) 27%

• C) 44%

• D) 73%