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3 years ago

Please help

2 answers:

5 0

Uracil doesn't present in DNA and the order of nitrogenous bases in DNA is Adenine, Guanine, Cytosine, Thymine

In short, Your Answer would be Option A

Hope this helps!

Zina [86]3 years ago

4 0

The base pairs in DNA are A+T and G+C so the first set.

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A single atom of an element has 11 protons, 11 electrons, and 12 neutrons. Which element is it?

Sever21 [200]

Answer:

protons+neutrons = atomic mass

11+12 = 23

so the element which has an atomic mass of 23 is

<h2>Sodium (Na)</h2>

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3 years ago

Using the example in the above information determine the empirical formula of a compound if a sample contains 0.130 g of nitroge

olga2289 [7]

Answer: The empirical formula for the given compound is $NO_2$

Explanation : Given,

Mass of O = 0.370 g

Mass of N = 0.130 g

To formulate the empirical formula, we need to follow some steps:

Step 1: Converting the given masses into moles.

Moles of Oxygen = $\frac{\text{Given mass of oxygen}}{\text{Molar mass of oxygen}}=\frac{0.370g}{16g/mole}=0.0231moles$

Moles of Nitrogen = $\frac{\text{Given mass of nitrogen}}{\text{Molar mass of nitrogen}}=\frac{0.130g}{14g/mole}=0.00928moles$

Step 2: Calculating the mole ratio of the given elements.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.00928 moles.

For Oxygen = $\frac{0.0231}{0.00928}=2.4\approx 2$

For Nitrogen = $\frac{0.00928}{0.00928}=1$

Step 3: Taking the mole ratio as their subscripts.

The ratio of O : N = 2 : 1

Hence, the empirical formula for the given compound is $NO_2$

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3 years ago

Why might it be useful to determine the elements that a planet or moon is made up of?

GuDViN [60]

to see if its copatible with our environment or to see if there is any unkown element, otherwise i dont know

if wrong very sorry

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