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2 years ago

3.. Which type of graph would be most helpful for comparing the calorie-content in a variety of

Chemistry

1 answer:

Sindrei [870]2 years ago

7 0

Answer:

d. Bar graph

Explanation:

a. Line graph - this type of graph is best for continuous data, such as how a the sales of a particular cereal drop over time

b. Pie chart - this is best for % data, such as looking at the % of different nutrients (carbohydrates, fats, proteins) in a cereal

C. Stem-and-leaf plot - presents quantitative data such as the ages of people who buy a brand of cereal

d. Bar graph - this is best for plotting different numbers in distinct categories to compare them to one another

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Read 2 more answers

At 25.0°c, a solution has a concentration of 3.179 m and a density of 1.260 g/ml. the density of the solution at 50.0°c is 1.249

oksano4ka [1.4K]

Answer: -

3.151 M

Explanation: -

Let the volume of the solution be 1000 mL.

At 25.0 °C, Density = 1.260 g/ mL

Mass of the solution = Density x volume

= 1.260 g / mL x 1000 mL

= 1260 g

At 25.0 °C, the molarity = 3.179 M

Number of moles present per 1000 mL = 3.179 mol

Strength of the solution in g / mol

= 1260 g / 3.179 mol = 396.35 g / mol (at 25.0 °C)

Now at 50.0 °C

The density is 1.249 g/ mL

Mass of the solution = density x volume = 1.249 g / mL x 1000 mL

= 1249 g.

Number of moles present in 1249 g = Mass of the solution / Strength in g /mol

= $\frac{1249 g}{396.35 g/mol}$

= 3.151 moles.

So 3.151 moles is present in 1000 mL at 50.0 °C

Molarity at 50.0 °C = 3.151 M

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