4.2 g of hydrogen is required to release 1.2 x 10^3 kJ of heat.
Given from the question that 1 mole of hydrogen gas contains 2 g of hydrogen gas.
We also know that heat of combustion per mole of hydrogen gas –285.8 kJ.
From the question, we are told that heat released by the reaction is -1.2 x 10^3 kJ of heat.
Hence;
If 2g of hydrogen releases –285.8 kJ of heat
x g of hydrogen releases -1.2 x 10^3 kJ of heat
x g = 2g x -1.2 x 10^3 kJ / –285.8 kJ
xg = 4.2 g of hydrogen
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Seems correct. Your steps make sense, the molar ratios are right and you've done it in a clear easy to follow manner. I see no issues with it.
Answer:
Valency Radical Ion
Monovalent [1] Hydroxide OH1-
Nitrite NO21-
Nitrate NO31-
Bicarbonate [Hydrogen carbonate] HCO3
Answer:
A.
Explanation:
if it's the same element the protons will always be the same, but have different neutrons, and neutrons is made up of protons and atomic mass, which atomic mass numbers can be calculated different where in return gives different numbers of neutrons.
EX: say the element is carbon, carbon has 6 protons and that won't change, but carbon can have an atomic mass of 12, 13, or 14, etc. so when you make up the neutrons you add protons and atomic mass, 6 + 12 = 18 N
6 + 13 = 19 N
6 + 14 = 20 N
