The branch of science that deals with the identification of the substances of which matter is composed
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The speed of the car = 22.25 m/s
<h3>Further explanation</h3>
Given
A distance of 22.75 km
Time = 17.04 minutes
Required
The speed (in m/s)
Solution
Speed is the ratio of distance per time
Can be formulated :
v = d/t
v= speed, m/s
d=distance=m
t=time,s
Input the value :
Answer:
a
Explanation:
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Answer:
Here's what I find
Explanation:
Mercerization involves the treating of cotton fibres with NaOH solution and then drying them under tension.
The process changes the internal structure of the fibres and causes them to swell.
The advantages of mercerization are:
- Greater affinity for dyes (saves money)
- Increased tensile strength
- A high degree of lustre (better appearance)
- Greater absorption of moisture (e.g., sweat)
- Greater resistance to shrinking
Answer:
C₆H₆
Explanation:
We need to find the molecular formula of a compound of carbon (C) and hydrogen (H), so what <em>we need to find out is the number of atoms of C and of H in the molecule.</em> We know:
- molar mass = 78.1 g/mol
- C% = 92.3% = 92.3 g C / 100 g compound
So, in 1 mol of compound, 92.3% of the mass corresponds to Carbon:
<u>mass of C / mol of compound</u> = molar mass × C% = 78.1 g/mol × 92.3/100 = <u>72.1 g/mol</u>
<u>moles of C</u> = mass C / molar mass C = 72.1 g / 12.011 g/mol
moles of C = 6 moles of C per mol of compound
If 72.1 g in a mol of compound are Carbon atoms, the difference between the molar mass and the mass of Carbon atoms will correspond to H atoms in 1 mol of compound:
<u>mass of H / mol of compound</u> = molar mass - mass of C/mol
mass of H = 78.1 g / mol - 72.1 g /mol = <u>6.0 g/mol of compound</u>
<u>moles of H</u> = mass H / molar mass H = 6.0 g / 1.008 g/mol
moles of H = 6.0 moles of H per mol of compound
<em>So</em><em> one mol of compound has 6 moles of C and 6 moles of H.</em>
The molecular formula is then written as C₆H₆
