Answer : The initial quantity of sodium metal used is 17.25 grams.
Solution : Given,
Volume of
gas = 8.40 L
Molar mass of Na metal = 23 g/mole
The Net balanced chemical reaction is,
![2Na+2H_2O\rightarrow 2NaOH+H_2](https://tex.z-dn.net/?f=2Na%2B2H_2O%5Crightarrow%202NaOH%2BH_2)
At STP, 22.4 L of volume is occupied by 1 mole of
gas
so, 8.40 L of volume is occupied by =
= 0.375 moles of
gas
Now from the above reaction, we conclude that
1 mole of
gas produced by the 2 moles of Na metal
0.375 moles of
gas produced =
of Na metal
The quantity of Na metal used = Moles of Na metal × Molar mass of Na metal = 0.75 moles × 23 g/mole = 17.25 grams
Therefore, the initial quantity of sodium metal used is 17.25 grams.
Answer:
Cells need to divide to reproduce.
Explanation:
They go through numerous stages, such as mitosis to further replicate themselves. They can't get things done alone, so they have to work in numbers.
Answer:
C. It has the same types of atoms on both sides of the reaction arrow.
<h2>What is a chemical equation?</h2>
A chemical equation is a symbolic representation of a chemical reaction; Reactants are represented on the left and the products on the right.
The law of conservation of mass states that in a closed system, mass is neither created nor destroyed during a chemical or physical reaction. The law of conservation of mass is applied whenever you balance a chemical equation. It is also applicable to stoichiometry. A balanced equation demonstrates the conservation of mass by having the same number of each type of atom on both sides of the arrow.
Consider the balanced equation for the combustion of methane.
![CH_4 + 20_2 \implies CO_2 + 2H_2O](https://tex.z-dn.net/?f=CH_4%20%2B%2020_2%20%5Cimplies%20CO_2%20%2B%202H_2O)
All balanced chemical equations must have the same number of each type of atom on both sides of the arrow.
In this equation, we have 1 C atom, 4 H atoms, and 4 O atoms on each side of the arrow.
The number of atoms does not change, so the total mass of all the atoms is the same before and after the reaction. Mass is conserved.
The same atoms of the same element that are present in the reactants are also present in the products, according to the rule of conservation of matter.
This leads us to believe that the response to the question is true because: It has the same atom kinds on both sides of the reaction arrow (Option C)
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Answer:
m = 575 g
Explanation:
Given data:
Volume of solution = 0.500 L (0.500×1000 = 500 mL)
Density of glucose solution = 1.15 g/mL
Mass of glucose solution = ?
Solution:
Formula:
d = m/v
d = density
m = mass
v = velocity
Now we will put the values in formula.
1.15 g/mL = m/500 mL
m = 1.15 g/mL × 500 mL
m = 575 g
(a) The speed of light in the unknown substance is determined 1.82 x 10⁸ m/s.
(b) The light will bend away from the normal since speed of light in air is not equal to speed of light in the substance.
<h3>What is the speed of light?</h3>
The speed of light passing from air into the substance is calculated as follows;
refractive index = speed of light in air / speed of light in the substance
speed of light in the substance = speed of light in air/refractive index
speed of light in the substance = (3 x 10⁸) / (1.65)
speed of light in the substance = 1.82 x 10⁸ m/s
Thus, the light will bend away from the normal since speed of light in air is not equal to speed of light in the substance.
Learn more about speed of light here: brainly.com/question/104425
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