Explanation:
1 literThe total of water is equal to 1000.0 g of water
we need to find the molality of a solution containing 10.0 g of dissolved in Na₂S0₄1000.0 g of water
1. For that find the molar mass
Na: 2 x 22.99= 45.98
S: 32.07
O: 4 x 16= 64
The total molar mass is 142.05
We have to find the number of moles, y
To find the number of moles divide 10.0g by 142.05 g/mol.
So the number of moles is 0.0704 moles.
For the molarity, you need the number of moles divided by the volume. So, 0.0704 mol/1 L.
The molarity would end up being 0.0704 M
The molality of a solution containing 10.0 g of Na2SO4 dissolved in 1000.0 g of water is 0.0704 Mliter
Answer:
(a) -134 kJ (b) -136 kJ
Explanation:
a) Using the accounting of the enthalpy of broken and formed bonds we will have the answer for this question ( remember the enthalpy of bonds broken are positive and those formed are negative)
ΔHrxn(kJ) = 6H (C-H) + 1 (C-C)+ 1H (H) + 1(C=C) + 4(C-H)
= 6(-411) +(-346) +432 + 602 + 4(411)
= - 134 kJ
(b) ΔHrxn = ΔHºf(C2H6) - ΔHºf (C2H4) = -83.75 kJ- 52.3 kJ = -136 kJ
( ΔHºf (H2)) = 0)
Answer:
Use bags that are not of plastic and that we can reuse.
Explanation:
To reduce the number of petroleum, people should use everyday things that do not have plastic in their composition. For example, drink water from a flask made of iron, take your mug to the coffee store or use cloth bags. These elements are not disposable, and we can use them multiple times, which leads to a reduction in the consumption of plastic products and the amount of petroleum needed for their production.
Frequency and energy have a direct relationshipWave Y transfers about three times the amount of energy as wave Z because energy and frequency have a direct relationship
Answer: The SI unit for measuring distance is meter
Explanation:
