Chemistry High School

150g of 80% pure ZnCO3 is completely reacted with excess HCI to produce ZnCl2, CO₂, and H₂O.
i. Which one is limiting reactant?
ii. Calculate the mass of ZnCl₂ formed?
iii. How many molecules of water are produced?
iv. What volume of CO2 are produced if the reaction is carried out at 27°C and 760 mm of Hg pressure?​

Answers

Answer 1

The balanced chemical equation of the given statement is-

       Zn + 2HCl → ZnCl2 + H2

How to calculate balanced chemical equation?

Zn has a molar mass of 65.38 g mol 1.

HCl has a molar mass of 36.458 g mol-1.

Calculate the moles of each reactant:

  (1 mol Zn/ 65.38 g Zn)  (150 g Zn) = 2.2943 mol Zn

 (1 mol HCl/ 36.458 g HCl)  (73 g HCl) = 2.0023 mol HCl

Because there is an excess of zinc (Zn), hydrochloric acid (HCl) must be the cause.                                    

 restricting agent.

 Hydrochloric acid (HCl) is the limiting agent.

The mass in molars of    

136.3 g mol-1 is ZnCl2.

 Cu has a molar mass of 68g mol-1.

  Magnesium (Mg) being a limiting reagent results in:

  (10.00 g Mg) divided by (1 mol Mg / 24.305 g Mg), (1 mol Cu / 1 mol Mg), and (68 g Cu / 1 mol Cu) yields 28.15 g.

28.15 grams of formed ZnCl2.

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Related Questions

oxides of active metals, such as cao, react with water to form____

Answers

The oxides of active metals react with water to form metal hydroxides.

An active metal reacting with water produces a base. The first group of elements in the reactivity series is the most reactive metals. When they react with water, the plus charge on the metal is canceled by the negative charge of the hydroxide ion. Hence, there is a formation of the basic oxide.

Compounds such as calcium oxide (CaO) reacts with water to form calcium hydroxide. It is commonly known as slaked lime which is the end product of this process.

This is a type of combination reaction. Combination reactions are the types of reactions in which two reactants combine to form a new product and also release heat energy during the reaction.

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How many molecules are in 1. 8 g of H2O?.

Answers

There are approximately 6.022 x 10^22 (6.022 x 10²²) molecules in 1.8 grams of H2O.

To determine the number of molecules in 1.8 g of H2O, we first need to know the molar mass of H2O. The molar mass of H2O is 18.015 g/mol. To convert the mass of H2O to moles, we divide it by the molar mass:

1.8 g H2O / 18.015 g/mol = 0.1 mol H2O

Next, we use Avogadro's number (6.022 x 10^23) to convert moles to number of molecules:

0.1 mol H2O x 6.022 x 10^23 molecules/mol = 6.022 x 10^22 molecules

So, there are approximately 6.022 x 10^22 (6.022 x 10²²) molecules in 1.8 grams of H2O.

It is worth noting that, 1 mole of any substance contains Avogadro's number of entities of that substance. And Avogadro's number is a fundamental constant of nature which is used to express the number of atoms, ions, or other elementary entities in a given sample of a substance.

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What share of modern renewable energy supplies does hydroelectric power account for?.

Answers

The shares of modern renewable energy supplies in the Hydroelectric power is 22%.

The Hydropower technologies generate power by using the elevation difference created by a dam or diversion structure of water flowing. The Hydropower is the affordable source of electricity that costs less than others. Hydropower relies only on the energy from moving water. As compared to other electricity sources, hydropower has relatively low costs throughout in terms of maintenance, operations, and fuel.  Hydropower's have longer lifespan with low costs. It is a reliable form of backup power during major electricity outages or disruptions. Hydroelectric power produces a number of benefits outside of electricity generation such as flood control, irrigation support, and water supply.

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