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RideAnS [48]
2 years ago
5

How many grams of sodium carbonate (Na2CO3) are needed to produce 6.78

Chemistry
1 answer:
olya-2409 [2.1K]2 years ago
7 0

Answer:

359.3g of Na₂CO₃ are required

Explanation:

When sodium carbonate, Na₂CO₃ reacts with HCl, NaCl and H₂O are produced as follows:

Na₂CO₃ + 2HCl → 2NaCl + CO₂ + H₂O

<em>Where 1 mole of sodium carbonate produce 2 moles of NaCl</em>

<em />

To solve this question, we must find the moles of sodium carbonate required to produce the 6.78 moles of NaCl. With this mass and the molar mass we can find the mass of sodium carbonate as follows:

<em>Moles Na₂CO₃:</em>

6.78 moles NaCl * (1mol Na₂CO₃ / 2mol NaCl) = 3.39 moles Na₂CO₃

<em>Mass Na₂CO₃ -Molar mass: 105.99g/mol:</em>

3.39 moles Na₂CO₃ * (105.99g / mol) =

<h3>359.3g of Na₂CO₃ are required</h3>
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8 0
3 years ago
How much volume (in cm^3)is gained by a person who gains 11.8 lb of our fat? Human fat has a density of 0.918 g/cm^3
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The volume (in cm³) gained by a person who gains 11.8 lb of fat is 5830.49 cm³

<h3>What is density? </h3>

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

<h3>How to convert pounds to grams </h3>

1 lb = 453.592 g

Therefore,

11.8 lb = 11.8 × 453.592

11.8 lb = 5352.3856 g

<h3>How to determine the volume </h3>
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  • Volume =?

Volume =  mass / density

Volume =  5352.3856 / 0.918

Volume = 5830.49 cm³

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3 0
2 years ago
The atomic number of an element is the total number of which particles in the nucleus?
VARVARA [1.3K]

An atom of element has there subatomic particles namely, proton, electron and neutron. Here, for a neutral atom, number of proton is equal to number of electron (this is not in the case of ions), this is equal to atomic number of an atom. In an atom, nucleus contains protons and neutrons which is responsible for mass of the atom and electrons move around nucleus in fixed orbits. Thus, atomic mass of an atom is equal to sum of number of protons and neutrons.

Option (b): Proton is the particle in nucleus of an atom, whose total number is equal to atomic number of that atom.

(4) Option (b): Atoms of same element have same atomic number because mass number can be different for different isotopes of atom. Since, atomic number is equal to number of protons, thus, number of protons are same for all atoms of the same element.

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4 0
3 years ago
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sukhopar [10]
The answer is A) KF. The rest are covalent. 
8 0
3 years ago
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How to calculate from moles to grams?<br> 4.0 moles of Cu(CN)2
andreyandreev [35.5K]

Answer: The mass of given amount of copper (II) cyanide is 462.4 g

Explanation:

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