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Oxana [17]
2 years ago
3

Express each of the following numbers in exponential notation Part 2:

Chemistry
1 answer:
padilas [110]2 years ago
4 0

1) 500,000,000,000,000 will be 5.0 x 10^{14

2)0.000,000,08 will be 8.0 x 10^{-8}

3)0.000,000,000,000,9 will be 9.0 x 10^{-13}

4)7,000 will be 7.0 x 10^3

5)0.004 will be 4.0 x 10^{-3

<h3>Rules guiding exponential notation</h3>

Writing numbers in exponential notations have some guiding rules. These include:

  • The base is always 10
  • The exponent cannot be zero and must be an integer. It can be positive or negative
  • The coefficient can take any form - negative or positive, integer or decimal. All significant digits must be included after the decimal.

Following these rules

1) 500,000,000,000,000 will be 5.0 x 10^{14

2)0.000,000,08 will be 8.0 x 10^{-8}

3)0.000,000,000,000,9 will be 9.0 x 10^{-13}

4)7,000 will be 7.0 x 10^3

5)0.004 will be 4.0 x 10^{-3

More on exponetial notation can be found here: brainly.com/question/18073768

#SPJ1

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An unknown compound contains only carbon, hydrogen, and oxygen (CxHyOz). Combustion of 6.50 g of this compound produced 9.53 g o
OverLord2011 [107]

Answer:

There were 0.216 moles of oxygen in the sample

Explanation:

Step 1: Data given

Mass of compound = 6.50 grams

Mass of CO2 = 9.53 grams

Molar mass of CO2 = 44.01 g/mol

Mass of H2O = 3.90 grams

Molar mass H2O = 18.02 g/mol

Step 2: Calculate moles CO2

Moles CO2 = 9.53 grams / 44.01 g/mol

Moles CO2 = 0.217 moles

Step 3: Calculate moles C

For 1 mol CO2 we have 1 mol C

For 0.217 moles CO2 we have 0.217 moles C

Step 4: Calculate mass C

Mass C = 0.217 moles C *12.01 g/mol

Mass C = 2.61 grams

Step 5: calculate moles H2O

Moles H2O = 3.90 grams / 18.02 g/mol

Moles H2O = 0.216 moles

Step 6: Calculate moles H

In 1 mol H2O we have 2 moles H

In 0.216 moles H2O we have 0.433 moles H

Step 7: Calculate mass H

Mass H = 0.433 moles * 1.01 g/mol

Mass H = 0.437 grams

Step 8: Calculate mass O

Mass O = 6.50 grams - 2.61 grams - 0.437 grams

Mass O = 3.453 grams

Step 9: Calculate moles O

Moles O = 3.453 grams / 16.0 g/mol

Moles O = 0.216 moles

There were 0.216 moles of oxygen in the sample

4 0
3 years ago
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Answer: a

Explanation:

scientific notation is about how many places passed the decimial place you are moving. therefor in order to get  1,550,000,000 you would move the decimial from 1.55 over nine times to the right

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