Stoichiometry

Convert 1.25 mol Ca into atoms Ca

• 6.25 atoms Ca

• 7.53 x 10²³ atoms Ca

• 8.38 x 10²⁴ atoms Ca

• 1.23 x 10²³ atoms Ca

Tags

NGSS.HS-PS1-7

Write the equation for percent by mass of an element in a compound?

• mass of element in the compound / molar mass of the compound * 100

• molar mass of the compound / mass of element in the compound molar mass of the compound * 100

• molar mass = mass of element in the compound / mass of the pressure

• mass of pressure over 10

Tags

NGSS.HS-PS1-7

The empirical formula is the formula of a compound in which the subscripts are reduced to the-

• Highest

• Lowest

• Most

• Medium

Tags

NGSS.MS-PS1-1

What is the molecular formula?

• is reduced

• It is the formula in which the subscripts specify the actual number of atoms of each element in one molecule or formula unit of the substance.

• is in the simplest form

• is in the highest form that it can be

Tags

NGSS.MS-PS1-1

Trichlorobenzen has an empirical formula of C2HCL and a molar mass (molecular formula mass) of 181.44 g/mol. What is the molecular formula of trichlorohenzene?

• C₆H₃Cl₃

• C₂ClH

• C₄H₂Cl₃

• C₈H₄Cl₅

A compound is 54.5% carbon, 9.1% hydrogen, and 36.4%

oxygen by mass. Its molar mass is 88.1 g/mol. What is its empirical and molecular formula?

• H₃C₄O₉, C₂HO₂

  

• C₅H₂O₄, H₂C₈O₃

• C₂H₄O₂, C₄H₈O₂

• C₄H₈O₂, C₂H₄O₂

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What would this reaction be : 1MgF₂ + 1Li₂CO₃ -> 1MgCO₃ + 2LiF

• Double Replacement

• Single Replacement

• Synthesis

• Neutralization

How many moles of Potassium bromide are formed when 0.236 moles of Aluminum sulfate are also formed? 2AlBr₃ + 3K₂SO₄ -> 6KBr + 1Al₂(SO₄)₃

• 5.29 mol Kbr

• 3.42 mol KBr

• 7.28 mol KBr

• 3.43 mol KBr

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

What is the mass of Beryllium fluoride when it is required to produce 122.5 grams of Rubidium fluoride? 2RbNO₃ + 1BeF₂ -> 1Be(NO₃)₂ + 2RbF

• 28.09 g BeF₂

• 72.92 g BeF₂

• 27.5 g BeF₂

• 35.2 g BeF₂

Tags

NGSS.HS-PS1-7

What is the theoretical yield (grams) of silver produced from 6.2 moles of copper and an excess of silver nitrate? 2AgNO₃ + 1Cu -> 1Cu(NO₃)₂ + 2Ag

• 1028 g Ag

• 829 g Ag

• 192 g Ag

• 1340 g Ag

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7