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mina [271]
3 years ago
15

Sodium Oxide (Na2O) can react with hydrochloric acid (HCl) to produce sodium chloride (NaCl) and water (H2O) according to the fo

llowing equation: Na2O + 2HCl -> 2NaCl + H2O How many total atoms are present before and after the reaction? A) 2 before and 2 after
B) 3 before and 3 after
C) 5 before and 5 after
D) 7 before and 7 after
Chemistry
2 answers:
nika2105 [10]3 years ago
6 0

The answer is D) 7 before and 7 after

Just had this question

Sonbull [250]3 years ago
5 0

Answer:

D) 7 before and 7 after

Step-by-step explanation:

  Na₂O   +  2HCl    ⟶    2NaCl      +   H₂O

3 atoms + 4 atoms ⟶ 2×2 atoms + 3 atoms

        7 atoms         ⟶    4 atoms   + 3 atoms

        7 atoms         ⟶            7 atoms

There are seven atoms present before and after the reaction.


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3.5 x 10^22 moles of carbon are there in a 0.70 g (3.5 carat) diamond.

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If the copper is drawn into wire whose diameter is 9.50 mm, how many feet of copper can be obtained from the ingot? The density
ankoles [38]

Answer:

The length of the wire = 352.66 feet.

Explanation:

A copper refinery produces a copper ingot weighing 150 lb. If the copper is drawn into wire whose diameter is 9.50 mm, how many feet of copper can be obtained from the ingot? The density of copper is 8.94 g/cm3. (Assume that the wire is a cylinder whose volume is V = πr2h, where r is the radius and h is its height or length.)

Step 1: Convert lb to kg

150 lb = 68.0389 kg

Step 2: Calculate volume of copper

Volume = mass / density

Volume = 68038.9 grams / 8.94 g/cm³

Volume = 7610.6 cm³ Cu

Step 3: Calculate length of wire

The diameter of the wire is 9.50 mm, so the radius is half of that (4.75 mm), or 0.475 cm.

The total "volume" of the wire is πr²h = (π)*(0.475 cm)²(h) = 0.708h = 7610 cm^3

7610 = 0.708h

h = 10749 cm = length of wire

The length of the wire = 352.66 feet.

7 0
3 years ago
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