It’s Tetracarbon dioxide :)
Answer:
option C is the correct answer
Explanation:
it belongs to alkanes series
for alkane series the formula is
C n H 2n+2
so the formula of b utane is
C 4 H 10
Answer:
<u>Ruler A
:</u>
According to ruler A, the diameter of the circle has only one certain digit and one uncertain digit. if we look at measurement of a diameter, it contain two significant figures. so the certainty of the diameter measurement is <em>smaller.
</em>
<u>Ruler B
:</u>
According to ruler B, the certainty of the diameter measurement is <em>greater. </em>because it contain two certain and one uncertain digit. it has three significant figures.
Answer:
x = 100 * 1.1897 = 118.97 %, which is > 100 meaning that all of the HClO2 dissociates
Explanation:
Recall that , depression present in freezing point is calculated with the formulae = solute particles Molarity x KF
0.3473 = m * 1.86
Solving, m = 0.187 m
Moles of HClO2 = mass / molar mass = 5.85 / 68.5 = 0.0854 mol
Molality = moles / mass of water in kg = 0.0854 / 1 = 0.0854 m
Initial molality
Assuming that a % x of the solute dissociates, we have the ICE table:
HClO2 H+ + ClO2-
initial concentration: 0.0854 0 0
final concentration: 0.0854(1-x/100) 0.0854x/100 0.0854x / 100
We see that sum of molality of equilibrium mixture = freezing point molality
0.0854( 1 - x/100 + x/100 + x/100) = 0.187
2.1897 = 1 + x / 100
x = 100 * 1.1897 = 118.97 %, which is > 100 meaning that all of the HClO2 dissociates
Reaction between aluminium and oxygen can be represented as:
4Al(s) + 3O₂(g) ----->2Al₂O₃(s)
Number of moles of aluminium = Mass of aluminium/ Molar mass of aluminium
=4.2g /26.981 g / mol
=0.155 mol
The equation shows that these react with 0.155 * 3/4 moles of O2 = 0.11 moles of O2.
1 mole of O2 at STP occupies 22.4 liter
volume of O2 = 0.11 moles ×22.4 liters / mol
= 2.61 liter of O2.
