Answer: x=4
y=3
Step-by-step explanation:
12x-8y=24
6x-y=21
---------------------
y=6x-21
12x-8(6x-21)=24
12x-48x+168=24
-36x=-144
x=144/36
x=4
y=24-21
y=3
Answer:
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oof 2016
Area of rhombus = length x height = 6 x 4 = 24 units²
Answer: 24 units²
5(x + 3) + x = 4(x + 3) + 3
4 + 6(2 + x) = 2(3x + 8)
which one has no solutions ?
What is 12 divided by 5.25?
What is 24 divided by 10.99?
6 ÷ 3.45 = 1.739
12 ÷ 5.25 = 2.285
24 ÷ 10.99 = 2.183
Brainlest please!
Answer:
The enthalpy change per mole of sodium when sodium reacts with water is 28.36 kJ
Step-by-step explanation:
The given parameters are;
Mass of sodium = 8 grams = 0.008 kg
Volume of water = 227 cm³ = 0.000227 m³
Initial water temperature, T₁ = 298 K
Final water temperature, T₂ = 308.4 K
Specific heat capacity of water = 4.18 J/(K·g)
Density of water = 1000 kg/m³
Mass of water = 1000×0.000227 = 0.227 kg = 227 g
Heat change, ΔH = m×c×ΔT = m×c×(T₂ - T₁)
ΔH = 227*4.18*(308.4 - 298) = 9868.144 J = 9.868 kJ
Molar mass of sodium = 22.989769 g/mol
Therefore, 8 grams contains;
8/22.989769 = 0.348 moles of Na
Which gives the enthalpy change per 0.348 moles of Na when sodium reacts with water = 9.868 kJ
Therefore, when one mole of Na reacts with water we have;
The enthalpy change per 0.348/0.348 = 1 mole of Na when sodium reacts with water = 9.868 kJ/0.348 = 28,358.3 J = 28.36 kJ.