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Neporo4naja [7]
3 years ago
14

Which element is classified as a noble gas at STP?(1) hydrogen (3) neon(2) oxygen (4) nitrogen

Chemistry
1 answer:
strojnjashka [21]3 years ago
3 0
Neon is the element that is classified as a noble gas at STP.
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How many moles of copper are present in a sample that contains 4.55 x 10^24 atoms of copper
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How many grams of sodium phosphate are formed by the reaction of 10 g of sodium with phosphoric acid?
Norma-Jean [14]

Answer:

23.8g of sodium phosphate are formed

Explanation:

Based on the reaction of sodium, Na, with phosphoric acid, H₃PO₄:

3Na + H₃PO₄ → Na₃PO₄ + 3/2 H₂

<em>3 moles of sodium produce 1 mole of sodium phosphate</em>

<em />

To solve this question we must find the moles of sodium in 10g. Using the chemical reaction we can find the moles -And the mass- of sodium phosphate produced, as follows:

<em>Moles Na -Molar mass: 22.99g/mol-</em>

10g * (1mol / 22.99g) = 0.435 moles Na

<em>Moles Na₃PO₄:</em>

0.435 moles Na * (1mol Na₃PO₄ / 3mol Na) = 0.145 moles Na₃PO₄

<em>Mass Na₃PO₄ -Molar mass: 163.94g/mol-</em>

0.145 moles Na₃PO₄ * (163.94g/mol) =

<h3>23.8g of sodium phosphate are formed</h3>
8 0
2 years ago
Which of the following is an example of a physical change?
o-na [289]

Answer:

I think b is the correct answer

7 0
3 years ago
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