Chemistry Quiz 3

How many moles are there in 3.00 g of ethanol, CH3CH2OH?

0.0652 mol

How many anions are there in 2.50 g of MgBr2?

1.64 x 10^22 anions

How many moles of C8H18 contain 9.25 x 10^24 molecules of C8H18?

15.4 moles C8H18

What is the mass of 8.50 x 10^22 molecules of NH3?

2.40 g

What is the molar mass of nitrogen gas?

28.0 g/mol

What is the charge on the Sc ions in Sc2O3?

3+

How many Fe(II) ions are there in 20.0 g of FeSO4?

7.92 x 10^22 iron (II) ions

Write the formula for barium nitrite.

Ba(NO2)2

Write the formula for barium nitride.

Ba3N2

What is the empirical formula for C12H24O6?

C2H4O

The chemical formula for calcium nitride is

Ca3N2

Determine the name for Cl2O.

Dichlorine monoxide

What is the chemical formula for iron (III) sulfate?

Fe2(SO4)3

The chemical formula for nitrous acid is

HNO2(aq)

Which of the following exists as a diatomic molecule?

Hydrogen

The solid compound, K2SO4, contains

K+ and SO4^-2 ions

Identify the compound with ionic bonds.

KBr

Give the structure for lithium hypochlorite.

LICIO

The chemical formula for lithium peroxide is

Li2O2

What is the chemical formula for magnesium hydride?

MgH2

Which of the following exists as a polyatomic molecule?

Phosphorus

Give the name for PBr3.

Phosphorus tribromide

The chemical formula for the sulfite ion is

SO3^2-

Give the formula for stannous nitrate.

Sn(NO3)2

Write the name for Sr3(PO4)2.

Strontium phosphate