Chemistry, 03.02.2021 19:10 eyebang

1. Which of these equations is balanced, and which is not balanced? la)2C2H60 702-4002 06H20
b) 2MGCO3 O HASO4 - 2MgSO4 HOD 2002

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Answer from: itryna1

The balanced equations are given below:

1. 2C₂H₆ + 7O₂ > 4CO₂ + 6H₂O

2. MgCO₃ + H₂SO₄ > MgSO₄ + H₂O + CO₂

Explanation:

The correct equation of the chemical reaction occurring in the two instances is given below:

C₂H₆ + O₂ > CO₂ + H₂O

MgCO₃ + H₂SO₄ > MgSO₄ + H₂O + CO₂.

To balance the equations above, we ensure that the number of moles of atoms of each element taking part in both reactions is equal on both the reactant and product side of the reaction.

1. 2C₂H₆ + 7O₂ > 4CO₂ + 6H₂O

2. MgCO₃ + H₂SO₄ > MgSO₄ + H₂O + CO₂

The above equations are balanced. In equation 1, 4 moles of carbon atoms are present on both sides of the reaction; 12 moles of hydrogen atoms are present on both sides of the reaction; and 14 moles of oxygen atoms are present on both sides of the reaction.

In equation 2, 1 mole of magnesium atom is present on both sides of the reaction; 1 mole of carbon atom is present on both sides of the reaction; 7 moles of oxygen atoms are present on both sides of the reaction; and 2 moles of hydrogen atoms are present on both sides of the reaction.

Answer from: Quest

first, consult an activity series chart to determine if al is more reactive than fe. it is, so it will replace the fe. now, one can continue with the problem.

next, make sure you have a correctly balanced equation.

3feo + 2al ==> 3fe + al2o3

now, determine which reactant (feo or al) is in limiting supply.

moles feo present = 125 g x 1 mole/71.8 g = 1.74 moles

moles al present = 25.0 g x 1 mole/26.98 g = 0.927 moles

since from the balanced equation, it take 3 mol feo for every 2 mol al, al will be limiting.

you can determine this simply by dividing moles of each by their coefficient in the balanced equation. for example: 1.74/3 = 0.58 and 0.927/2 = 0.464. al is less, so it is limiting.

finally, using the stoichiometry in the balanced eq. determine mass of fe that can be produced from 0.927 moles of al.

0.927 moles al x 3 moles fe/2 moles al x 55.8 g/mole = 77.6 g

Answer from: Quest

The answer to your question really depends on three things: how much water you have, how cold it is to start out, and how cold the things around it are. water actually freezes when it gets to 32 degrees fahrenheit (0 degrees celsius), but the time it takes to get there may be different. let's start with the first. if you take two glasses, and fill one with a tiny bit of water, and the other about halfway, then put them both in the freezer, the one with less water will freeze first (you can try this at home, but i recommend using plastic cups and not glass ones). now let's move on to the second part. let's say you have two glasses, and you fill one with really cold water that has been in the refrigerator, and the other with really hot water from the sink. if you put both of them in the freezer, the one that started out colder will freeze first. for the third part, let's imagine that you have two glasses with the same amount of water in them, and the water is at the same temperature. imagine putting one outside on a really really cold day in georgia, and having a friend in alaska put one outside on the same day. since it would be so much colder in alaska, the glass of water there would freeze before yours. so, if you took a tiny bit of really cold water in a glass, and put it outside on a cold day in alaska, it would freeze a lot faster than a big glass of hot water outside on a cold day in georgia.

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