Chemistry, 13.07.2019 03:10 edfwef5024

Answer quickly!
how many grams of h3po4 are produced when 12.81 moles of water react with an excess of p4o10?
select one:
a. 837
b. 1880
c. 471
d. 8.54

Answers: 1

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Answer from: personm21

A. 837 grams of H_3PO_4 are produced when 12.81 moles of water react with an excess of $P_4O_{10}$

Explanation:

The balanced chemical equation is

P_4 O_10 + 6 H_2 O 4 H_3 PO_4

Mole ratio of H_2 O:H_3 PO_4 is 6 : 4 or 3 : 2

As per the Equation

6 moles of water produces 4 moles of Phosphoric acid

So let us convert

12.81 moles H_2 O to moles H_3 PO_4 by using mole ratio and then to mass by multiplying with molar mass

$12.82 mol H_2 O \times \frac {(4mol H_3 PO_4)}{(6molH_2 O)} \times \frac {(98gH_3 PO_4)}{(1mol H_3 PO_4 )}$

=837g H_3 PO_4 is produced

Please note:

Molar mass is the mass of 1 mole of the substance and its unit is g/mol

We find the molar mass by adding the atomic mass of the atoms present in it.

For example H_3 PO_4 contains 3 atoms of H, 1 atom of P and 4 atoms of O

So the molar mass

$=(3\times1.008)+(31\times1)+(4\times16)=98 g/mol$

Answer from: Quest

Herbivores, carnivores, omnivores, decomposers, herbivores

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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