Calcium cyanamide reacts with water to form calcium...

Calcium cyanamide reacts with water to form calcium carbonate and ammonia. $$\mathrm{CaCN}_{2}(s)+3 \mathrm{H}_{2} \mathrm{O}(l) \longrightarrow \mathrm{CaCO}_{3}(s)+2 \mathrm{NH}_{3}(g)$$ a. How many grams of $\mathrm{H}_{2} \mathrm{O}$ are needed to react with $75.0 \mathrm{~g}$ of $\mathrm{CaCN}_{2} ?$ b. How many grams of $\mathrm{NH}_{3}$ are produced from $5.24 \mathrm{~g}$ of $\mathrm{CaCN}_{2}$ ? c. How many grams of $\mathrm{CaCO}_{3}$ form if $155 \mathrm{~g}$ of $\mathrm{H}_{2} \mathrm{O}$ reacts?

Calcium cyanamide reacts with water to form calcium carbonate and ammonia.
$$\mathrm{CaCN}_{2}(s)+3 \mathrm{H}_{2} \mathrm{O}(l) \longrightarrow \mathrm{CaCO}_{3}(s)+2 \mathrm{NH}_{3}(g)$$
a. How many grams of $\mathrm{H}_{2} \mathrm{O}$ are needed to react with $75.0 \mathrm{~g}$ of $\mathrm{CaCN}_{2} ?$
b. How many grams of $\mathrm{NH}_{3}$ are produced from $5.24 \mathrm{~g}$ of $\mathrm{CaCN}_{2}$ ?
c. How many grams of $\mathrm{CaCO}_{3}$ form if $155 \mathrm{~g}$ of $\mathrm{H}_{2} \mathrm{O}$ reacts?

Key Concepts

Balanced Chemical Equation

A balanced chemical equation represents the conservation of mass, showing that the number of atoms for each element is the same on both sides of the reaction. It provides the stoichiometric coefficients which are used as conversion factors in quantitative problems.

Mole Concept

The mole concept is fundamental in chemistry as it defines a specific number of particles (6.022 x 10^23 entities) corresponding to one mole of a substance. This allows chemists to count atoms and molecules by weighing them, bridging the gap between the atomic scale and macroscopic measurements.

Molar Mass

Molar mass is the mass of one mole of a substance and is expressed in grams per mole (g/mol). It is used to convert between the mass of a substance and the number of moles, which is essential in stoichiometric calculations.

Stoichiometric Calculations

Stoichiometric calculations involve using the balanced chemical equation to determine the quantitative relationships between reactants and products. This process includes converting masses to moles, using mole ratios to relate different substances, and then converting moles back to grams if necessary.

Dimensional Analysis

Dimensional analysis is a systematic approach that utilizes conversion factors to move between units in chemical calculations. It ensures that units cancel appropriately and helps verify that the final answer has the correct units, making it an essential tool in solving stoichiometry problems.

Transcript

Please give Ace some feedback