General Chemistry 1

Calculate the mass percentages of the elements in CO$_2$

Stupidium is a fictional element with 2 isotopes, $^35$St with a mass of 34.9567 g/mol, and $^39$St with a mass of 39.0095 g/mol. The molar mass of St is 35.9826 g/mol. What are the percent abundances of the isotopes?

Naturally occurring boron is composed of 19.8% of $^{10}$B and 80.2% of $^{11}$B. Atoms of $^{10}$B have a mass of of 10.0129 u and those of $^{11}$B have a mass of 11.0093 u. Calculate the average atomic mass of boron.

N$_2$ + 3 H$_2$ $\longrightarrow$ 2 NH$_3$

If 5.0 grams of N$_2$ react with excess H$_2$ how many grams of NH$_3$ will the reaction yield?

P$_4$ + 5 O$_2$ $\longrightarrow$ 2 P$_2$O$_5$

Starting with 8.00 g P$_4$ and 8.00 g of O$_2$, how many grams of P$_2$O$_5$ will the reaction yield?

CuCl$_2$ + Zn $\longrightarrow$ ZnCl$_2$ + Cu

20.0 mL of 1.50 M CuCl$_2$ reacts with 3.00 Zn. How many grams of ZnCl$_2$ does the reaction yield?

3 F$_2$ + S $\longrightarrow$ SF$_6$

Sulfur hexafluoride, a very good indicator, is prepared by the reaction of sulfur with elemental fluorine. What mass of SF$_6$ can be produced from the reaction of 150 g of S with 650 g of F$_2$ ?

MM of F$_2$ = 38.00 g/mol

MM of SF$_6$ = 146.06 g/mol

What is the molarity of a solution containing 8.00 g NaCl in 500.0 mL?

Write the complete, total, and net ionic equations for the reaction of aqueous sodium carbonate with aqueous barium nitrate.

Write the complete, ionic, and net ionic equations for the reaction of HCl with KOH.

P$_4$ + 6 Cl$_2$ $\longrightarrow$ 4 PCl$_3$

Assign oxidation numbers for each of the atoms in the above equation.

2 MnO$_4$ + 5 H$_2$O$_2$ + 6 H $^+$ $\longrightarrow$ 5 O$_2$ + 2 Mn$^{2+}$ + 8 H$_2$O

Assign oxidation numbers for each of the atoms in the above net ionic equation. Identify which elements have been oxidized or reduced.

A sample of nitrogen has a volume of 883 mL and a pressure of 741 torr. What pressure will change the volume to 655 mL at the same temperature?

What will be the final pressure of a sample of nitrogen with a volume of 955 mL at 745 torr and 25 $^{\circ}$C if it is heated to 62 $^{\circ}$C and given a final volume of 1155 mL?

How many grams of Ar are in a 12.0 L cylinder of argon at a pressure of 57.8 atm and a temperature of $25^{\circ}$C ?

Rank the following gasses in order of increasing rates of effusion:

O$_2$

Ar

CO$_2$

N$_2$

He

SO$_2$

4 Fe(s) + 3O$_2$(g) $\longrightarrow$ 2 Fe$_2$O$_3$(s) $\triangle$H = -1640 kJ

How many kJ of heat can be produced from 50.0g iron?

Find the enthalpy of reaction, $\triangle$H$_{rxn}$ , for the combustion of sugar (there is usually a table of enthalpies of formation in the back of chemistry textbooks)

C$_6$H$_{12}$O$_6$ (s) + 6 O$_2$ (g) $\longrightarrow$ 6 CO$_2$ (g) + 6 H$_2$O (l)

An infectious organism can be completely destroyed by irradiation of UV light with a wavelength of 254 nm. What is the frequency of this radiation?

When n = 7, list all valid sets of quantum numbers.