Answer: The molar mass of the element is 40 g/mol and element is Calcium.
Explanation:
At STP:
1 mole of a gas contains 22.4 L of volume
Molar mass is defined as the mass of 1 mole of a substance.
To calculate mass of of the substance, we use the equation:
Volume of gas = 22.4 L
Density of gas = 1.7824 g/L
Putting values in above equation, we get:
The element having molar mass 40 g is Calcium.
Hence, the molar mass of the element is 40 g/mol and element is Calcium.
The statement is conclusive evidence that mixing sugar in water is a physical change is there is no molecular change. Therefore, option D is correct.
A change known as physical change occurs when the physical characteristics of matter change. Physical changes include those in color, odor, solubility, and the condition of matter, among others.
Melting, turning into a gas, changing strength or durability, changing crystal structure or texture, and changing shape, size, color, volume, or density are a few examples of physical qualities.
Because sugar molecules are spread throughout the water, but the individual sugar molecules remain unaltered, dissolving sugar in water represents a physical change.
Thus, option D is correct.
To learn more about the physical change, follow the link;
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D.) There is no molecular change
Answer:
The mass of sodium reacted is 138 grams
Explanation:
Firstly, the chemical reaction should be represented with a balance chemical equation. The chemical equation can be written as follows.
Na = sodium
Cl2 = chlorine gas
Na + Cl2 → NaCl
The balanced equation is
2Na(s) + Cl2(g) → 2NaCl(aq)
Atomic mass of sodium = 23 grams per mol
Atomic mass of chlorine = 35.5 grams per mol
From the chemical equation the molar mass are as follows
Sodium = 2 × 23 = 46 grams
Chlorine = 35.5 × 2 = 71 grams
Sodium chloride = 2 × 23 + 2 × 35.5 = 117 grams
if 46 grams sodium reacted to produce 117 grams of sodium chloride
? grams of sodium react to produce 351 grams sodium chloride
grams of sodium reacted = (351 × 46)/117
grams of sodium reacted = 16146/117
grams of sodium reacted = 138 grams
Answer:
0.138 kg of Na.
Explanation:
Equation of the reaction
2Na(aq) + Cl2(g) --> 2NaCl(s)
By stoichiometry, since 2 moles of Na reacted with 1 mole of Cl2 to produce 2 moles of NaCl. Therefore,
Calculating the number of moles present,
Cl2:
Number of moles = mass/molar mass
Molar mass of Cl2 = 35.5 * 2
= 71 g/mol.
= 213 * 71
= 3 moles.
NaCl:
Molar mass = 23 + 35.5
= 58.5 g/mol.
Number of moles = mass/molar mass
= 351/58.5
= 6 moles.
Since they both have equal moles,
Mass of Na = number of moles * molar mass
Molar mass of Na = 23 g/mol
= 23 * 6 moles
= 138 g
= 0.138 kg of Na.
b. a covalent compound because it has a low boiling point
c.an ionic compound because it has a low melting point
d.a covalent compound because it has a low melting point
Answer: A solid compound in a sealed container is a covalent compound because it has a low melting point.
Explanation:
Ionic compounds have strong electrostatic forces which are strong in nature and cannot be broken down at low temperature.
Whereas covalent compounds have Vanderwaal forces which are weak in nature. Therefore, covalent compounds melts at low temperature.
Thus, it can be concluded that a solid compound in a sealed container is a covalent compound because it has a low melting point.
Answer: The answer is d
Explanation:
Answer:
12.58 g/cm³
Explanation:
V = 7×4×1 = 28cm³
ρ = m/V = 352/28 ≈ 12.58 g/cm³