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To determine the mass needed to generate a specific amount of heat (in kJ) during a reaction, you need to know the enthalpy change (ΔH) of the reaction, which indicates how much heat is absorbed or released per mole of reactant. Using the formula ( q = n \times ΔH ), where ( q ) is the heat in kJ and ( n ) is the number of moles, you can rearrange this to find ( n = \frac{q}{ΔH} ). Then, multiply the number of moles by the molar mass of the reactant to obtain the required mass.
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How do you do reacting mass calculations?
Reacting mass calculations involve determining the amounts of reactants needed to produce a certain amount of product in a chemical reaction. Start by writing a balanced chemical equation and converting the given mass of one reactant to moles. Use the mole ratio from the balanced equation to calculate the moles of the other reactant needed. Finally, convert the moles of the second reactant to mass if required.
What is specific heat capacity and what does it measure?
Specific heat capacity(q) is the amount of heat needed to raise a tamperature of a body with mass of 1kg by 1K or 1 decree celcius. The formuale to calculate it is c(specific heat capacity) = Q/mass x change in temperature.
How much energy is needed to melt 25.4grams of l2?
To calculate the energy needed to melt 25.4 grams of I2 (iodine), you can use the formula: energy = mass x heat of fusion. The heat of fusion for iodine is 15.52 kJ/mol. First, find the molar mass of I2 (253.8 g/mol) and then convert the mass to moles. Finally, multiply the moles by the heat of fusion to get the energy needed.
If 5.58 g of iron react with sulfur to produce 8.79 g of iron sulfide what is the mass of reacting sulfur?
To find the mass of reacting sulfur, we can use the law of conservation of mass, which states that the mass of the reactants equals the mass of the products. Here, the mass of iron sulfide produced (8.79 g) is the sum of the mass of iron (5.58 g) and the mass of sulfur. Thus, the mass of sulfur can be calculated as: Mass of sulfur = Mass of iron sulfide - Mass of iron Mass of sulfur = 8.79 g - 5.58 g = 3.21 g. Therefore, the mass of reacting sulfur is 3.21 g.
How is the H fusion used to calculate the energy needed to melt a mass of solid?
The heat fusion (H fusion) is the amount of energy required to change a substance from solid to liquid at its melting point. To calculate the energy needed to melt a mass of solid, you multiply the mass of the substance by its heat of fusion. The formula used is ( Q = m \cdot H_f ), where ( Q ) is the energy required, ( m ) is the mass, and ( H_f ) is the heat of fusion. This calculation provides the total energy needed to completely melt the solid into a liquid at its melting temperature.
What element does a low mass star stop at and why?
Helium. A low mass star does not have enough mass to generate the heat needed to fuse helium.
How do you do reacting mass calculations?
Reacting mass calculations involve determining the amounts of reactants needed to produce a certain amount of product in a chemical reaction. Start by writing a balanced chemical equation and converting the given mass of one reactant to moles. Use the mole ratio from the balanced equation to calculate the moles of the other reactant needed. Finally, convert the moles of the second reactant to mass if required.
How is hfusion used to calculate the energy needed to mention a mass of a solid?
The formula for calculating the energy needed to melt a mass of a solid is Heat energy = mass x specific heat capacity x ΔT + mass x heat of fusion. This formula includes the specific heat capacity of the material, the change in temperature, and the heat of fusion required to melt the material.
Do nuclear reactors have critical mass?
We know that critical mass can be achieved in a nuclear reactor. If it could not, we'd not be able to get a chain reaction and generate heat to generate power. Reactors don't have critical mass when the control rods are in, but pull the rods, start the reactor up and away you go!
What caused the failed star Jupiter to not ignite and become a fully-fledged star?
Jupiter did not become a star because it lacks the mass needed to sustain nuclear fusion in its core. Stars need a certain amount of mass to generate enough pressure and heat for nuclear fusion to occur, and Jupiter's mass is not sufficient for this process to take place.
What does the amount of heat needed to raise an objects temperature depend on?
The amount of heat needed to raise an object's temperature depends on its mass, its specific heat capacity, and the temperature change desired. Objects with higher mass require more heat to raise their temperature, while those with higher specific heat capacities absorb more heat for the same temperature change.
What type of energy needs very little mass?
Nuclear energy is a type of energy that needs very little mass. Nuclear energy is used to generate electricity and heat.
What do you need to know to calculate the heat needed to melt a block of ice at its melting point?
To calculate the heat needed to melt a block of ice at its melting point, you need to know the mass of the ice block, the specific heat capacity of ice, and the heat of fusion of ice (or latent heat of fusion). The formula to calculate this heat is Q = m * ΔHf, where Q is the heat energy, m is the mass, and ΔHf is the heat of fusion.
How much heat is needed to heat a copper penny from 30 to 35 degrees Celsius?
You need to know the mass of this coin.Heat (in calories) = 5 x 0,092 x mass (in g)
What is specific heat capacity and what does it measure?
Specific heat capacity(q) is the amount of heat needed to raise a tamperature of a body with mass of 1kg by 1K or 1 decree celcius. The formuale to calculate it is c(specific heat capacity) = Q/mass x change in temperature.
Which muscle fiber helps generate heat for the body?
The skeletal muscles are responsible for heat generation in the body. This is because they account for 40% of body mass and are required for maintaining body temperature.
What is the relationship of mass an object to the amount of heat required to change its temperature?
The amount of heat required to change the temperature of an object is directly proportional to its mass. This means that the larger the mass of an object, the more heat is needed to change its temperature by a certain amount.
