Chemistry Answers

Convert the following number of moles of chemical into its corresponding mass in grams.

1. 0.436 moles of ammonium chloride

2. 2.360 moles of lead (II) oxide

3. 0.031 moles of aluminium iodide

4. 1.077 moles of magnesium phosphate

5. 0.50 moles of calcium nitrate

Compute for answer of these and round your final answer following the rules of significant figures.

1. 1567.00829 x 17.0812

2. 145.9807 + 12.98563

3. 10986.074957 - 450.219

4. 5.0008 x 3.4875231

B.

Covert the following values:

1.

35 oC to oF

2.

238 oF to K

3. 475 K to oF

4. 32 oC to K

H₃PO₄ + Mg(OH)₂ → Mg₃(PO₄)₂ + H₂O

Draw line structure that represent the following IUPAC names:

A. 1,1- Diethylcyclohexane

B. 1,3,5 - Trimethylcycloheptane

Draw and name the alkanes that meet the following descriptions:

A. An alkane with a tertiary carbon atom

B. An alkane that has both a tertiary and quaternary carbon atom

Draw both condensed and line structures corresponding to the following IUPAC names and label each carbon as primary, secondary, tertiary or quaternary:

A. 3- Methylhexane

B. 3,4- Dimethyloctane

C. 2,2,4- Trimethylpentane

Draw any two of the seven branched-chain isomers with the formula C7H16

Draw the straight-chain isomer with the formula C7H16

Propose structure for molecules that fit the following descriptions:

A. C2H4O containing an aldehyde functional group

B. C3H6O2 containing a carboxylic acid functional group

Calculate the standard enthalpy of formation of carbon disulfide (CS2) from

its elements, given that

C(graphite) + O2(g) ⟶ CO2(g) ∆H°rxn = - 393.5 kJ/mol

S(rhombic) + O2(g) ⟶ SO2(g) ∆H°rxn = - 296.4 kJ/mol

CS2 (l) + 3O2(g) ⟶ CO2(g) + 2SO2(g) ∆H°rxn = - 1073.6 kJ/mol