How many moles of h2 are needed for kJ?

How many grams of H2 Do you need to get KJ of heat?

2 Answers. The answer is 8.3 g of H2 .

How do you calculate KJ G?

In order to convert kilojoules per gram to kilojoules per mole, you need to multiply by grams per mole. Now, let’s say that you’re dealing with a compound that has a molar mass of x g mol−1 . This tells you that 1 mole of this compound has a mass of x g .

How do you calculate the number of moles needed?

Determine the moles of product produced by dividing the grams of product by the grams per mole of product. You now have calculated the number of moles of every compound used in this reaction.

How do you find the kJ of heat produced?

To calculate the amount of heat released in a chemical reaction, use the equation Q = mc ΔT, where Q is the heat energy transferred (in joules), m is the mass of the liquid being heated (in kilograms), c is the specific heat capacity of the liquid (joule per kilogram degrees Celsius), and ΔT is the change in …

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How do you find moles given kJ?

kJ is the units “Joules” multiplied by a number (kilo = x1000) that has no units of it’s own. kJ/mol is just the J multiplied by a number that has no units on it’s own: 1000/mol. The number of moles of something is just a number with no units of it’s own.

How do you convert kJ to mol to kJ?

Re: How to convert kJ/mol to J

Answer: Cancel out the 1/mol unit by dividing by the Avogadro constant. Then convert kJ to J by multiplying the kJ value by 1000 (because of the conversion factor 1 kJ = 1000 J).

How do you convert kJ to kJ mol?

kJ is the units “Joules” multiplied by a number (kilo = x1000) that has no units of it’s own. kJ/mol is just the J multiplied by a number that has no units on it’s own: 1000/mol.

How do you find kJ in chemistry?

Calculating energy changes

  1. = 100 × 4.2 × 20 = 8,400 J.
  2. It is also useful to remember that 1 kilojoule, 1 kJ, equals 1,000 J. …
  3. Moles of propane burned = 0.5 ÷ 44 = 0.01136.
  4. So, the molar enthalpy change, ∆H = 8.4 ÷ 0.01136 = 739 kJ/mol.

How do you find the number of moles in a liquid?

MOLES FROM VOLUME OF PURE LIQUID OR SOLID

Multiply the volume by the density to get the mass. Divide the mass by the molar mass to get the number of moles.

How do you do Stoich?

Almost all stoichiometric problems can be solved in just four simple steps:

  1. Balance the equation.
  2. Convert units of a given substance to moles.
  3. Using the mole ratio, calculate the moles of substance yielded by the reaction.
  4. Convert moles of wanted substance to desired units.
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What is Delta H in Chem?

In chemistry, the letter “H” represents the enthalpy of a system. … Therefore, delta H represents the change in enthalpy of a system in a reaction. Assuming a constant pressure, a change in enthalpy describes a system’s change in heat.

What is Delta E in chemistry?

Delta E is defined as the difference between two colors in an L*a*b* color space. As the values determined are based on a mathematical formula, it is important that the type of color formula is taken into account when comparing the values.