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4 years ago

12

What does the atomic number of an atom tell you ?

1 answer:

drek231 [11]4 years ago

8 0

Hello there!

The atomic number of an atom tells you an element's identity, and informs you of how many protons are present in the nucleus of the atom.

For example;
Potassium is an element with the symbol "K" on the periodic table that belongs in the Alkali Metal group, and has an atomic number of 19. This means that Potassium has 19 protons.

I hope this helps!

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If 3.0 moles of A and 4.0 moles of B react according to the hypothetical reaction below, how many moles of the excess reactant w

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1 mol of A should be left over

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3 years ago

Read 2 more answers

What mass of carbon dioxide is produced from the complete combustion of 6.00×10−3 g of methane?

Crazy boy [7]

The answer for the following problem is explained below.

<u><em>Therefore 16.5 × 10^-3 grams of carbon dioxide is produced from the complete combustion.</em></u>

Explanation:

Given:

mass of methane = 6.00 × 10^-3 grams

$CH_{4}$ + $O_{2}$ → $CO_{2}$ + $H_{2}O$

Firstly balance the following equation:

Before balancing the equation:

$CH_{4} + O_{2}$ → $CO_{2} + H_{2} O$

After balancing the equation:

$CH_{4} + 2O_{2}$ → $CO_{2} + 2 H_{2} O$

where;

$CH_{4}$ represents methane molecule

$O_{2}$ represents oxygen molecule

$CO_{2}$ represents carbon dioxide molecule

$H_{2}O$ represents water molecule

$CH_{4}$ +2 $O_{2}$ → $CO_{2}$ + 2 $H_{2}O$

16 grams of methane → 44 grams of carbon dioxide

6 × 10^-3 grams of methane → ?

= $\frac{44*6.00*10^{-3} }{16}$

= 16.5 × 10^-3 grams of carbon dioxide is produced from the complete combustion.

<u><em>Therefore 16.5 × 10^-3 grams of carbon dioxide is produced from the complete combustion.</em></u>

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3 years ago

Need help ASAP!!!! Will give brainliest!!

erik [133]

for one you could do a bell, ringing noise, then say someone rang it.

For two you could do tunnel, echoing, then say someone yelled and it echoed.

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