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3 years ago

If an atom has 30 electrons and 35 neutrons, what is its approximate atomic mass? what is the name of this element?

1 answer:

6 0

30 electrons = atomic number
Look at your periodic table. You will see zinc has a atomic number (the top number) of 30.

When you add 30 and 35 you get 65. The is the atoms ATOMIC MASS. So looking at zinc on the periodic table, look at its bottom number, which is its atomic mass. It will be 65.

This means the name of the element is ZINC.

Hope this helped!

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vodomira [7]

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3 years ago

Calculate the mass of ammonia (NH3) that contains a billion (1.00 * 10^12) hydrogen atoms.

Lynna [10]

Answer:

The mass of ammonia (NH3) that contains $1.00 \times 10^12$ hydrogen atoms is $9.4\times 10^{-12}$ g.

Explanation:

As $6.022\times 10^{23}$ atoms of hydrogen = 1 mole of the hydrogen atom

Therefore, $10^{12}$ atoms of hydrogen $= \frac{1}{6.022 \times 10^{23}}\times 10^{12}=1.66\times 10^{-12}$ moles of the hydrogen atom.

Now, there are 3 moles of hydrogen atoms in 1 mole of ammonia $(NH_3)$ .

As the mass of 1 mole of ammonia is 17g, so

when there are 3 moles of hydrogen atoms, then the mass of ammonia = 17 g

Therefore, when there are $1.66\times 10^{-12}$ moles of hydrogen atoms, then the mass of ammonia $= \frac{17}{3}\times 1.66\times 10^{-12}=9.4\times 10^{-12$ g.

Hence, the mass of ammonia $(NH_3)$ that contains $1.00 \times 10^12$ hydrogen atoms is $9.4\times 10^{-12}$ g.

3 0

3 years ago

when an action potential abides by the all-or-nothing principle, once it reaches its threshold it moves all the way down the axo

Karolina [17]

Answer:

Yep and it's threshold is -55 mV.

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2 years ago

When given the following: density = 0.79 g/mL and mass =8g (answer can be found in your reading) What is the volume of the objec

tatyana61 [14]

Hey there!:

Density = 0.79 g/mL

mass = 8 g

Volume = ??

Therefore:

D = m / V

0.79 = 8 / V

Volume = 8 / 0.79

Volume = 10.126 mL

Hope this helps!

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2 years ago

If the reactants of a reaction have ab initial mass of 25 grams what is the mass of the product?

Studentka2010 [4]

Answer:

It remains the same

Explanation:

The law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. For example, the mass of sodium plus the mass of chlorine that reacts with the sodium equals the mass of the product sodium chloride.

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3 years ago