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Why law of conservation of mass has to be obeyed during stoichiometric calculations?
because mass can not be created
How many kg should weigh a 161 cm?
There is a range of acceptable weights (masses, really). Read about BMI (body mass index) to get the calculations for what is usually considered standard mass.
How do scientists determine the atomic mass of an atom?
By the number of protons and neurons in a element. each has a relative atomic mass of 1. an electron weighs around a 2000th of this, so is ignored for Ar calculations
What does the atomic mass of an element show you?
The Atomic Mass is the total mass of all the sub atomic particles (i.e. the mass of the whole atom): Electrons, Neutrons and Protons. Therefore, it identifies isotopes (as they have different number of sub atomic particales - even for the same element) and thus total mass differs. There can be a fair amount of difference between the Atomic Mass of the most common isotope of an element and its Atomic Weight - which is averaged (weighted average). This makes a difference for single atom calculations, but makes little real difference in bulk calculations.
What compound does CaCl2 make?
It depends on what it's reacting with. If it's not reacting with anything, then CaCl2 makes...CaCl2.
How are mass calculations used?
Mass percentage calculations determine the percentage of an element based on mass in a compound. This can then be used to determine the percentage in a compound of each individual element.
Why law of conservation of mass has to be obeyed during stoichiometric calculations?
because mass can not be created
How are percentage mass calculations used?
mass of the solute/(mass of solution + mass of the solute) x 100%ie: if 67.1g of CaCl2 is added to 275g of water, calculate the mass percent of CaCl2 in the solution.67.1/342.1=.1961.1961 x 100% = 19.6% of CaCl2
What is the maximum mass of aluminum chloride that can be formed when reacting 24.0 of aluminum with 29.0 of chlorine?
36.4 Grams
What is the amu of a beta particle?
A beta particle is an electron, this has a mass much less than a proton or neutron and so was can use zero in most situations. However in some calculations for mass defect of whole atoms and Q-value calculations in nuclear decays it can become important, in these calculations. An electron has a mass of 511 keV/(c^2), and an AMU is 931 MeV/(c^2). So, dividing the electron mass by the AMU mass, we get the mass of the beta in AMU: 511/931000 = 0.00055 AMU.
What is the maximum mass of aluminum chloride that can be formed when reacting 15.0 g of aluminum with 20.0 g of chlorine?
The maximum mass of Aluminium chloride formed will be 25.07g.
What is the mass for sodium oxide plus water?
Na2O + H2O ---> 2NaOH this is a metal oxide (base) reacting with water to form an alkali. Mass of NaOH is 40
What 2 particles have similar masses?
Protons and neutrons have near identical mass. One will not have to account for the difference in mass in most calculations.
How is stoichiometry used to calculate energy released when a mass liquid freezes?
The mol is involved in many chemical calculations. And the molar mass mass is calculated from the chemical formula.
Why does the law of conservation of energy have to include changes in mass?
It doesn't really have to - there is no such thing as "mass-to-energy conversion", rather, a change in energy will be accompanied by a change in mass. But the change in mass sometimes simplifies calculations.
Are scales used to measure mass?
Scales are used to measure weight. With the proper calculations and knowing the volume, you can determine the mass.
Is center of mass a reality?
It is better to think of it as an abstraction - but one that is very useful for many practical calculations.
