Chemistry- I really did help

Question

1. If you have 5.40grams of potassium (K) solid how many grams of potassium hydroxide (KOH) can be produced? _2__K(s) + _2__H2O(l) 🡪 _2__KOH(aq) + ___H2 (g)

1. If 0.251moles of H2O gas are produced, how many liters of oxygen gas was used?

___H2(g) + ___O2(g) 🡪 ___H2O(g)

2b. (use equation above) If 5.50liters of hydrogen is used to make water, how many grams of oxygen should be used also?

1. Stinky hydrogen sulfide (H2S) created by volcanoes is burned in this reaction. How many milliliters of H2S gas can be burned if you have 1.022 Liters of oxygen gas?

_2__H2S(g) + _3__O2(g) 🡪 _2__SO2(g) + _2__H2O(g)

1. How many moles of aluminum oxide (Al2O3) are created from 60.2grams of oxygen gas?

___Al(s) + ___O2(g) 🡪 ___Al2O3(s)

4b. (use equation above) If 0.372kg of aluminum is used, how many grams of aluminum oxide is produced?

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1. How many grams of calcium carbide (CaC2) are needed to use all 49.0grams of liquid water.

___CaC2(s) + ___H2O(l) 🡪 ___C2H2(g) + ___Ca(OH)2(aq)

1. How many molecules of ammonia (NH3) are produced when 0.0606kilograms of nitrogen gas are used?

___ N2(g) + ___H2(g) 🡪 ___NH3(g)

Using the theoretical yields above, find the percent yields.

1.  Using the theoretical yield from #1, find the percent yield if the actual is 7.05g

1. Using the theoretical yield from # 2, find the percent yield if the actual is 2.75L

1. Using the theoretical yield from #5, find the percent yield if the actual is 80.0g

Answer 1

For the first question, you need to convert the grams of potassium into moles and then use the molar ratio of the balanced equation to obtain the number of moles of potassium hydroxide. Using these moles, you can then convert to grams of KOH.