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3 years ago

Solve the problems. Express your answers to the correct number of significant figures.

Chemistry

2 answers:

skad [1K]3 years ago

7 0

Ans: 1) 1.41

2) 119.3

While adding two numbers, the rule of significant figures requires that the number of decimal places in the final answer is equal to that of the term with the least decimal places

In the given examples:

1) 0.09 - has 2 decimal places

1.324- has 3 decimal places

Sum = 0.09 + 1.324 = 1.414

Round off to 2 decimal places = 1.41

2) 41.0 - has 1 decimal place

78.3- has 1 decimal place

Sum = 41.0 + 78.3 = 119.3

Final answer will also have 1 decimal place = 119.3

Scilla [17]3 years ago

4 0

1. 1.141

2. 119.3

HOPE THIS HELPS.

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What would be the freezing point of a solution that has a molality of 1.324 m which was prepared by dissolving biphenyl (C12H10)

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The freezing point of a 1.324 m solution, prepared by dissolving biphenyl into naphthalene, is 71.12 ° C.

A solution is prepared by dissolving biphenyl into naphthalene. We can calculate the freezing point depression (ΔT) for naphthalene using the following expression.

$\Delta T = i \times Kf \times m = 1 \times 6.90 \°C/m \times 1.324m = 9.14 \°C$

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i: van 't Hoff factor (1 for non-electrolytes)
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m: molality

The normal freezing point of naphthalene is 80.26 °C. The freezing point of the solution is:

$T = 80.26 \° C - 9.14 \° C = 71.12 \° C$

The freezing point of a 1.324 m solution, prepared by dissolving biphenyl into naphthalene, is 71.12 ° C.

Learn more: brainly.com/question/2292439

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