Calcium hydride is a convenient, portable source of hydrogen that is used, among other things, to inflate weather balloons. Calcium reacts with hydrogen gas at $300400^{\circ} \mathrm{C}$ to form a hydride. [Hint: Balance the elements in the order Cl, H, $\mathrm{O}, \mathrm{Al}, \mathrm{N} .]$. Binary compounds of alkali metals and hydrogen react with water to liberate $\mathrm{H}_{2}(g) .$ The $\mathrm{H}_{2}$ from the reaction of a sample of NaH with an excess of water fills a volume of 0.490 L above the water. 6. The reaction of calcium hydride and water produces calcium hydroxide and hydrogen as products. We can start this problem by balancing our chemical reaction. (Such a mixture minimizes the mass of fuel that a rocket must carry.). You must be logged in to bookmark a video. And to translate this into a mass, we can multiply by the molar mass of calcium hydrate. The reaction of calcium hydride, $\mathrm{CaH}_{2},$ with water can be characterized as a Lewis acid-base reaction: $\mathrm{CaH}_{2}(s)+2 \mathrm{H}_{2} \mathrm{O}(l) \longrightarrow \mathrm{Ca}(\mathrm{OH})_{2}(a q)+2 \mathrm{H}_{2}(g)$ Identify the Lewis acid and the Lewis base among the reactants. (c) How many moles of $\mathrm{K}_{2} \mathrm{CO}_{3}$ are produced per milligram of $\mathrm{KO}_{2}$ consumed? The reaction of potassium superoxide, $\mathrm{KO}_{2}$, is used in life-support systems to replace $\mathrm{CO}_{2}(\mathrm{g})$ in expired air with $\mathrm{O}_{2}(\mathrm{g}) .$ The unbalanced chemical equation for the reaction is given below.$$\mathrm{KO}_{2}(\mathrm{s})+\mathrm{CO}_{2}(\mathrm{g}) \longrightarrow \mathrm{K}_{2} \mathrm{CO}_{3}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{g})$$(a) How many moles of $\mathrm{O}_{2}(\mathrm{g})$ are produced by the reaction of $88.0 \mathrm{g} \mathrm{CO}_{2}(\mathrm{g})$ with excess $\mathrm{KO}_{2}(\mathrm{s}) ?$(b) How many grams of $\mathrm{KO}_{2}(\mathrm{s})$ are consumed per$1.000 \times 10^{3} \mathrm{g} \mathrm{CO}_{2}(\mathrm{g})$ removed from expired air? Physical and chemical Properties of Hydrogen gas; What happen when hydrogen is passed over heated copper(ii) oxide? Determine the mass of $\mathrm{H}_{2}$ liberated and the mass of $\mathrm{NaH}$ that reacted. Hydrate. 11. And finally, we can multiply by the molar mass of water to translate this into grams rather than morals. Reaction of calcium with water; 5. And finally, we're asked what mass of calcium hydride must react with an excess of water to form 18.12 times 10 to the 24 molecules of hydrogen gas? Start Your Numerade Subscription for 50% Off!Join Today. What happen when hydrogen is passed over heated iron(III)oxide? The temperature of the gas is $35^{\circ} \mathrm{C}$ and the total pressure is 758 $\mathrm{mm} \mathrm{Hg}$ . So now we have moles of calcium hydride. How Iron reacts with steam; 8. (b) How many grams of calcium hydride are needed to form 4.500 g of hydrogen? Calculate the percentage by mass of $\mathrm{B}_{10} \mathrm{H}_{14}$ in a fuel mixture designed to ensure that $\mathrm{B}_{10} \mathrm{H}_{14}$ and $\mathrm{O}_{2}$ run out at exactly the same time. Under normal conditions calcium carbonate is water insoluble. Answer Text: How many grams of ethyl alcohol will result? How many moles of $\mathrm{H}_{2}(\mathrm{g})$ will be formed in the reaction between $0.82 \mathrm{mol} \mathrm{CaH}_{2}(\mathrm{s})$ and $1.54 \mathrm{mol} \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) ?$. So we see that when we have one mole of her calcium hydride, we have two moons of hydrogen guests. I don't have an account. C a H 2 (s) + H 2 O (l) ⟶ C a (O H) 2 (s) + H 2 (g) (not balanced) (a) How many grams of H 2 (g) result from the reaction of … Reaction of metals with steam. Calcium hydride, CaH $_{2},$ reacts with water to form hydrogen gas:$$\mathrm{CaH}_{2}(s)+2 \mathrm{H}_{2} \mathrm{O}(l) \longrightarrow \mathrm{Ca}(\mathrm{OH})_{2}(a q)+2 \mathrm{H}_{2}(g)$$This reaction is sometimes used to inflate life rafts, weather balloons, and the like, when a simple, compact means of generating $\mathrm{H}_{2}$ is desired. Reaction of calcium with water. The calcium metal sinks in water and after an hour or so bubbles of hydrogen are evident, stuck to the surface of the metal. So, doing this math, we find that 48.1 grams of water is consumed when it reacts with 56.2 grams over calcium hydride. Solid silver oxide, $\mathrm{Ag}_{2} \mathrm{O}(\mathrm{s}),$ decomposes at temperatures in excess of $300^{\circ} \mathrm{C},$ yielding metallic silver and oxygen gas. These usually occur when carbon dioxide is present. After a second or so, the calcium metal begins to bubble vigorously as it reacts with the water, producing hydrogen gas, and a cloudy white precipitate of calcium hydroxide. Summary of the reaction between metals with cold water and steam; 10. The balanced equation is: $\mathrm{CaH}_{2}(s)+2 \mathrm{H}_{2} \mathrm{O}(l) \longrightarrow \mathrm{Ca}(\mathrm{OH})_{2}(a q)+2 \mathrm{H}_{2}(g)$. So we know that we have one mole over calcium hydrate and two miles of water. If the reaction of $\mathrm{CaH}_{2}$ with water is used to inflate a balloon with $2.0 \times 10^{5} \mathrm{L}$ of $\mathrm{H}_{2}$ gas at $25^{\circ} \mathrm{C}$ and 1.00 atm pressure, how many kilograms of $\mathrm{CaH}_{2}$ is needed? And just like we did In the last part of this problem, we can divide by the molar mass of our calcium hydrate. So when we balance this equation, we can notice that we have an imbalance of our oxygen from the right to the left hand side. What mass of $\mathrm{CaH}_{2}$ is necessary to react with water to provide enough hydrogen gas to fill a balloon at $20^{\circ} \mathrm{C}$ and 0.8 atm pressure with a volume of 4.5 $\mathrm{L}$ ? 4. What is the mass percent $\mathrm{Fe}_{2} \mathrm{O}_{3}$ in the ore sample, assuming that none of the impurities contain Fe? Iron ore is impure $\mathrm{Fe}_{2} \mathrm{O}_{3} .$ When $\mathrm{Fe}_{2} \mathrm{O}_{3}$ is heated with an excess of carbon (coke), metallic iron and carbon monoxide gas are produced. How many grams of $\mathrm{CaH}_{2}$ are needed to generate 145 $\mathrm{L}$ of $\mathrm{H}_{2}$ gas if the pressure of $\mathrm{H}_{2}$ is 825 torr at $21^{\circ} \mathrm{C} ?$. Laboratory preparation of hydrogen gas. Calcium hydride reacts with water to form calcium hydroxide and hydrogen gas. Thus, when calcium oxide reacts with water, slaked lime is produced. Which Products are formed when burning hydrogen gas in air. The presence of the hydroxide is demonstrated by the addition of a few drops of phenolphthalein indicator, which turns the solution pink, indicating that the solution is basic. Calcium reacts slowly with water. Weight of CaH2 = 283.2g. (b) How many grams of water are needed to react with 0.371 mol of ethylene? So when we do that, Matt, we find that 12.2 grams of hydrogen gas is formed in the second part of this problem, were asked to find how many grams of water are consumed when we react 56.2 grams of our calcium hydride so we can start with the massive you're given of our calcium hydrate.

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