University Chemistry Practice Problems Exam 1

0.0974 moles

A length of copper wire has a mass of 6.19 g. How many moles of copper are in the wire?

3CaF2 + 3KaPO4 --> Ca3(PO4)2 + 6KF

A solution of calcium fluoride is mixed with a solution of potassium phosphate. Balance the equation by adding the missing coefficients?

P4 + 5O2 --> P4O10

Balance the reaction between elemental phosphorus P4(s) and O2(g) to make P4O10(s)?

19.38 g

Calculate the mass of CO2 produced from the decomposition of 74.00 g of NaHCO3.

152.15 g/mol

Calculate the molar mass of wintergreen, C8H8O3?

205.0 g

Calculate the number of grams of aluminum required to prepare 395.0 g of chromium metal by the first reaction?

84.313 g/mol

Determine the molar mass of magnesite, MgCO3?

3.0688 mol KCl

HCl + KOH → KCl + H2O How many moles of KCl will be produced from 111.89 g of HCl and excess KOH?

1.11e24

How many atoms of titanium are there in 0.920 mole of Ti2O3?

1.66e24

How many atoms of titanium are there in 0.920 mole of Ti3O5?

5.54e23

How many atoms of titanium are there in 0.920 mole of ilmenite, FeTiO3?

5.54e23

How many atoms of titanium are there in 0.920 mole of titanium(IV) chloride?

136 grams of CO2

How many grams of CO2 would be needed to have the same number of moles of CO2 as there are in 55.5 grams of H2O?

119.27 g

How many grams of the excess reactant are left after the reaction is complete?

21.3 g H2O

How many grams of water are produced by the reaction of 15.0 g of octane?

3.08 moles of water

How many moles of H2O are present in 55.5 grams of H2O?

2 moles of NaOH

How many moles of NaOH will react with 1 mole of H2SO4 in the photo?

9.46 mol

How many moles of sodium are there in 4.73 moles of Na2O4?

14.19 mol

How many moles of sodium are there in 4.73 moles of Na3PO4?

4.73 moles

How many moles of sodium are there in 4.73 moles of NaCl?

4.73 mol

How many moles of sodium are there in 4.73 moles of NaNO3?

3.61 g

How much C2H4N2 could be expected from the reaction of 13.9 g CO2, 2.19 g NH3, and 1.79 g CH4?

2.78 kg

How much NaAlO2 (sodium aluminate) is required to produce 2.37 kg of Na3AlF6?

11.7 g

If 0.650 mol of water evaporates, how many grams of water have evaporated?

30.1 %

If 9.53 g of NaCl reacts with excesses of the other reactants and 4.13 g of NaHCO3 is isolated, what is the percent yield of the reaction?

0.4211

If a cube of table sugar, which is made of sucrose, C12H22O11, is added to concentrated sulfuric acid, the acid "dehydrates" the sugar, removing the hydrogen and oxygen from it and leaving behind a lump of carbon. What fraction of the initial mass of sugar that remains is carbon? The answer should be in decimal form.

silver(I) oxide

Name Ag2O?

palladium(II) chloride

Name PdCl2?

Platinum(IV) Oxide

Name PtO2?

ruthenium(II) sulfide

Name RuS?

Tungsten(VI) Oxide

Name WO3?

Dinitrogen monoxide

Name this compound?

Dinitrogen tetraoxide

Name this compound?

carbon tetrachloride

Name this compound?

3+

The total oxide ion charge in a formula unit of Co2O3 is 6-. What is the charge on each cobalt ion?

2+

The total oxide ion charge in a formula unit of CoO is 2-. What is the charge on each cobalt ion?

4+

The total oxide ion charge in a formula unit of CoO2 is 4-. What is the charge on each cobalt ion?

molecular

Water (H2O) is molecular or ionic?

N2P3

What is the formula for dinitrogen triphosphide?

5 mol Ca(OH)2 per 3 mol PO43-

What is the relationship between the amount of Ca(OH)2 required to react with a given amount of PO43-?

95.1 mL

What is the volume of 1.07 mol of benzene (C6H6) at 20.7°C? The density of benzene is 0.879 g/mL.

C. Li (Lithium)

Which element is an alkali metal? A. Cl2 B. Br2 C. Li D. Xe

AlF3

Which substance contains the most positively charged cation? A. AlF3 B. SrO C. KI D. MgCl2

C3H8 (aq) + 5O2 (g) --> 4H2O (l) + 3CO2 (g)

Write a balanced chemical reaction, including states of matter, for the complete combustion of the gas propane (C3H8)?

SrF2

Write the chemical formula of strontium fluoride?

Barium Nitrate Ba(NO3)2

Write the chemical formulas for barium nitrate?

RbHCO3

Write the chemical formulas for rubidium bicarbonate?

Fe(CH3OO)3

Write the formula for iron(III) acetate?

Hg2O2

Write the formula for mercury(I) peroxide?

Sc(SCN)3

Write the formula for scandium thiocyanate?

ZnCr2O7

Write the formula for zinc dichromate?

Iron(III)

Write the name of the cation found in Fe(OH)3?

molecular

ammonia (NH3) is molecular or ionic?

Molecular

carbon disulfide (CS2) is molecular or ionic?

Ionic

magnesium oxide (MgO) is molecular or ionic?

ionic

magnesium sulfide (MgS) is molecular or ionic?