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3 years ago

Put 4.789 x 10^9 into standard notation.

Chemistry

2 answers:

Sergeu [11.5K]3 years ago

3 0

Answer:

4789000000

Explanation:

When we multiply anything by 10, we follow the base 10 system rules.

All we simply have to do is move the decimal place 9 places to the right.

4.789 x 10⁹ = 4789000000

KIM [24]3 years ago

3 0

Answer:

4,789,000,000

Explanation:

4.789 × 10⁹

using 10⁹ = 1

-----

10⁹

4.789. 4.789

---------- = ---------------------

10⁹ 1,000,000,000

4.789 × 10⁹ = 4, 789, 000, 000

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3.5g of a Certain compound X, known to be made of carbon, hydrogen, and perhaps oxygen, and to have a molecular molar mass of 15

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Answer:

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1. Calculate the mass of each element in 2.78 mg of X.

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$\text{Mass of C} = \text{5.13 g CO}_{2}\times \dfrac{\text{12.01 g C}}{\text{44.01 g }\text{CO}_{2}}= \text{1.400 g C}$

(b) Mass of H

$\text{Mass of H} = \text{2.10 g H$_{2}$O}\times \dfrac{\text{2.016 g H}}{\text{18.02 g H$_{2}$O}} = \text{0.2349 g H}$

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Divide all moles by the smallest number of moles.

$\text{C: } \dfrac{116.6}{116.6}= 1\\\\\text{H: } \dfrac{233.1}{116.6} = 1.999\\\\\text{O: } \dfrac{116}{116.6} = 1.00$

4. Round the ratios to the nearest integer

C:H:O = 1:2:1

5. Write the empirical formula

The empirical formula is CH₂O.

6. Calculate the molecular formula.

EF Mass = (12.01 + 2.016 + 16.00) u = 30.03 u

The molecular formula is an integral multiple of the empirical formula.

MF = (EF)ₙ

$n = \dfrac{\text{MF Mass}}{\text{EF Mass }} = \dfrac{\text{150 u}}{\text{30.03 u}} = 5.00 \approx 5$

MF = (CH₂O)₅ = C₅H₁₀O₅

The molecular formula of X is C₅H₁₀O₅.

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