Chem

Which is the correct formula for the compound whose percent composition is shown?

O=47.51%

K=38.62%

N=13.87%

• K₂NO₂

• KNO₂

• KNO₃

• K₄N₁₀O₃

Which element has a molar mass of 30.974 g/mol?

• Potassium

• Phosphorus

• Gallium

• Palladium

Which is the correct molar mass for the compound FeSO₄?

• 103.85 g/mol

• 151.91 g/mol

• 415.4 g/mol

• 247.85 g/mol

What is the mass of 8 moles of sodium chloride?

• 7.3 grams

• 468 grams

• 0.137 g/mol

• 468 mol

Which is the percent composition of bromine in the compound NaBr?

• 81.6%

• 79.9%

• 84.1%

• 77.7%

How many moles of atoms are in one mole of AlPO₄?

• 122.1 moles

• 7.35 x 10²⁵ moles

• 6 moles

• 6.02 x 10²³ moles

Which is the correct name for the hydrate whose composition is shown

32.3% H₂O

67.7% FePO₄

• Iron (III) Phosphate Hydrate

• Iron (III) Hydrophosphate

• Iron (III) Phosphate Tetrahydrate

• Iron (III) Phosphate Pentahydrate

How many formula units are in 3.6 grams of NaCl?

• 0.06

• 1.0 x 10²¹

• 1.3 x 10²⁶

• 3.7 x 10²²

A sample of Manganese (II) chloride has a mass of 19.8 grams before heating, and 12.6 grams after heating until all the water is driven out. Based on this information, how many water molecules were attached to each molecule of Manganese (II) chloride?

• 2

• 3

• 4

• 6

How many grams of phosphorus are in 500.0 grams of calcium phosphate?

• 49.92 grams

• 99.89 grams

• 310.2 grams

• 130.1 grams