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Scorpion4ik [409]
3 years ago
10

Why are the elements on the periodic table not arranged by mass?

Chemistry
1 answer:
Aleksandr-060686 [28]3 years ago
7 0

Answer:

A. Similar elements have such different masses that this would lead to a completely random arrangement of elements.

Explanation:

Because it is the number of protons, which is identical to the atomic number, that separates different elements from each other, not the atomic mass.

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The unbalanced equation below shows the reaction between sodium and water. In the reaction,
NISA [10]

Answer:

41.4 g

Explanation:

2Na(s) + 2H2O (l) ----> 2NaOH ( aq) + H2 (g)

According to the above balnced chemical equation the ratio between moles of H2 gas formed to moles of Na used up is 1:2

Molar mass ( Mass of 1 mol) Of H2 gas is 2 gmol-1

So in 1.8 g of H2 0.9 mol should be present

Therefore no. of moles of Na used should be 2× 0.9 = 1.8 moles

Molar mass of Na= 23 gmol-1

So mass of 1.8 mol of Na = 1.8× 23 g = 41.4g

5 0
2 years ago
You are measuring how many liters of oxygen are in a container. which of the following are you measuring?
svetoff [14.1K]

Answer:

d.

Explanation:

liters is a measure of volume, it is an SI accepted metric system unit

8 0
3 years ago
how many moles of sodium are needed to react with sulfuric acid to produce 3.75 moles of sodium sulfate according to the followi
anastassius [24]
Hello!
<span>
You'll need to react 7,5 moles of Sodium with sulfuric acid to produce 3.75 moles of sodium sulfate
</span>
First of all, you need to balance the reaction. The balanced reaction is shown below (ensuring that the Law of Conservation of Mass is met on both sides):

2Na + H₂SO₄ → Na₂SO₄ + H₂

Now, all that you have to do is to use molar equivalences in this reaction applying the coefficients to calculate the moles of Sodium that you'll need:

molesNa=3,75moles Na_{2} SO_4* \frac{2 moles Na}{1 mol Na_{2} SO_4} =7,5 moles Na 

Have a nice day!
5 0
3 years ago
What is the temperature of 0.750 of a gas stored in a 6,850 mL cylinder at 2.21 atm?
madam [21]
The answer would be 246 K
5 0
3 years ago
What are the alkali metals?
abruzzese [7]

Answer:

Are the six chemical elements

Explanation:

4 0
3 years ago
Read 2 more answers
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