Percent by Mass

What is the percent mass of aluminum in a sample of ore that contains 1.85 g of aluminum and1.65 g of oxygen?

• 1.12 % Al

• 89.2% A;

• 0.892% Al

• 52.9% Al

A compound contains 4.35 g of silver and 0.65 g of sulfur. What is the percentage of sulfur in the compound?

• 15%

• 0.13%

• 13%

• 7.7%

A sample of a compound with a mass of 22.8 g was formed from 6.22 g of carbon and an unweighed quantity of oxygen. What is the percent mass of the oxygen in the compound?

• 27.3 % O

• 72.8% O

• 22.2% O

• Their is not enough information to work the problem.

Tags

NGSS.MS-PS1-5

A compound consisting of aluminum and chlorine weighs 17.82 g. The aluminum in the compound weighs 3.60 g. What is the percent by mass of the chlorine in the compound?

• 79.8% Cl

• 20.2% Cl

• 25.3% Cl

• Their is not a correct answer.

Tags

NGSS.MS-PS1-1

A 1.12 g sample of hydrogen reacted with 13.88 grams of oxygen to form water. After the reaction 5.00 grams of oxygen remained unreacted. What is the percent by mass of oxygen in the water?

• 22.4% O

• 36.0% O

• 88.8% O

• 44.3% O

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2