3 years ago

How does the periodic table summarize what we know about elements?

2 answers:

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The periodic table shows our knowledge of the reactivity of elements and the atomic mass of elements. Hope this helps! :)

Aloiza [94]3 years ago

6 0

By grouping elements in either the same group or period

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2 years ago

If 30cm³ of 0.45 mol dm3 HCl reacted with NaOH, how many moles of HCl reacted?

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Moles HCl reacted : 0.0135

<h3>Further explanation</h3>

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

$\large {\boxed {\bold {M ~ = ~ \dfrac {n} {V}}}$

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

So to find the number of moles can be expressed as

n = V x M

The volume of HCl 30 cm³=3.10⁻² dm³

Molarity of HCl = 0.45 mol/dm³

so moles HCl reacted :

$\tt n=3.10^{-2}\times 0.45=0.0135$

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3 years ago