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Leno4ka [110]
3 years ago
10

A weather map is an example of a

Chemistry
2 answers:
arlik [135]3 years ago
5 0
C. Model. It's a graphical model that displays one or more weather elements. 
son4ous [18]3 years ago
3 0
The answer is c, kia1800 is correct because like that person said it's a graphical model that displays one or more weather elements. A hypothesis is a prediction made, based on observations, about the results of a scientific story or experiment so that's not the answer. A scientific theory try to explain an observation by experimentation and observations so that isn't the answer either. Also a variable are the things in a experiment that changes so that also isn't the answer.
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QUESTION 21 The combustion of ammonia in the presence of excess oxygen yields NO 2 and H 2O: 4 NH 3 (g) 7 O 2 (g) 4 NO 2 (g) 6 H
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Answer:

The answer to your question is 47.44 g of Oxygen

Explanation:

Data

mass of Ammonia = 14.4 g

mass of Oxygen = ?

Balanced chemical reaction

                 4NH₃  +  7O₂  ⇒  4NO₂  +  6H₂O

Process

1.- Calculate the molar mass of Ammonia

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2.- Calculate the molar mass of Oxygen

O₂ = 7[16 x 2] = 7[32] = 224 g

3.- Use proportions to calculate the mass of Oxygen

                     68g of NH₃ --------------------- 224 g of O₂

                      14.4 g of NH₃ -----------------  x

                       x = (14.4 x 224) / 68

                       x = 3225.6/ 68

                       x = 47.44 g

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