Calculate the grams or milliliters of solute needed to prepare the following solutions:

a. 150 mL of a $40.0 \%$ (m/v) $\mathrm{LiNO}_3$ solution

b. 450 mL of a 2.0 %(m / v) KOH solution

c. 225 mL of a $15 %(v / v) isopropyl alcohol solution

Calculate the number of equivalents in the following: $2$ moles of $OH^-$

Calculate the number of equivalents in the following: $1$ mole of $K^+$

Indicate whether aqueous solutions of each of the following solutes contain only ions, only molecules, or mostly molecules and a few ions: a. acetic acid, $\mathrm{CH}_3-\mathrm{COOH}$, a weak electrolyte b. $\mathrm{NaBr}$, a strong electrolyte c. fructose, $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6$, a nonelectrolyte

Predict whether the following ionic compounds is soluble in water:

$$PbS$$

Indicate the number of equivalents in each of the following:

a. 1 mole of $\mathrm{Mg}^{2+}$

b. 0.5 mole of $\mathrm{H}^{+}$

c. 4 moles of $\mathrm{Cl}^{-}$

d. 2 moles of $\mathrm{Fe}^{3+}$

Indicate the number of equivalents in each of the following:

a. 1 mole of $\mathrm{K}^{+}$

b. 2 moles of $\mathrm{OH}^{-}$

c. 1 mole of $\mathrm{Ca}^{2+}$

d. 3 moles of $\mathrm{CO}_3{ }^{2-}$

A sensory receptor sends a nerve impulse along afferent neurons, which connect to the spinal cord. These afferent neuron fibers pass through what structure to join the spinal cord?

Calculate the grams or milliliters of solute needed to prepare the following solutions:

a. 50.0 mL of a 5.0 %(m / v) KCl} solution

b. 1250 mL of a $4.0 \%(\mathrm{~m} / \mathrm{v}) \mathrm{NH}_4 \mathrm{Cl}$ solution

c. 250 .mL of a 10.0 %(v / v) acetic acid solution

Balance the following equation by algebraic method.

$$\ce{C3H8 + O2 \to CO2 H2O}$$

A gas mixture containing oxygen, nitrogen, and helium exerts a total pressure of 925 Torr. If the partial pressures are oxygen 425 Torr and helium 75 Torr, what is the partial pressure, in torr, of the nitrogen in the mixture?

Use molar volume to calculate the volume, in liters, occupied by 2.50 moles of $\mathrm{N_2}$ gas at STP.

Use the molar volume to calculate the following at $STP$: the number of moles of $O_2$ in $44.8$ $L$ of $O_2$ gas

A sample containing 1.50 moles of Ne gas has an initial volume of 8.00 L. What is the final volume of the gas, in liters, when a sample of 3.50 moles of Ne is added to the 1.50 moles of Ne gas in the container changes occurs in the quantity of the gas at constant pressure and temperature?