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Alenkinab [10]
2 years ago
12

An unknown substance is obtained by police. The forensics laboratory has

Chemistry
1 answer:
timurjin [86]2 years ago
5 0

Answer:

70.0 %

Explanation:

Step 1: Given data

  • Mass of nitrogen (mN): 74.66 g
  • Mass of the compound (mNxOy): 250 g

Step 2: Calculate the mass of oxygen (mO) in the compound

The mass of the compound is equal to the sum of the masses of the elements that form it.

mNxOy = mN + mO

mO = mNxOy - mN

mO = 250 g - 74.66 g = 175 g

Step 3: Determine the percent composition of oxygen in the sample

We will use the following expression.

%O = mO / mNxOy × 100%

%O = 175 g / 250 g × 100% = 70.0 %

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C. moles NaClO3 = 100 g / 106.44 g/mol = 0.939 mol NaClO3

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E. grams NaCl = 0.939 mol • 58.44 g/mol = 54.9 g NaCl

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G. grams of O2 = 1.41 mol • 32 g/mol = 45.1 g O2

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3 years ago
Explain how Bohr's model built on the ideas of Einstein and Planck.
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Explanation:

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3 years ago
A solid with a density of 3.57g/mL and mass of 19.5g is added to a graduated cylinder that contain 23.2mL of water. What is the
NNADVOKAT [17]

Answer:

Volume of liquid = 28.7 mL

Explanation:

Given data;

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v = 5.5 mL

Volume of liquid = volume of water + volume of solid

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Volume of liquid = 28.7 mL

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Explanation:

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