Answer: option (3) 1003 g.
Explanation:
1) 0.086 g has two signficant figures, because the zeros to the left of the decimal period and to the right of the decimal period and before the first non zero digit do not count. Those zeros only tell the place value of the other digits. So, only 8 and 6 are significan figures: two.
2) 0.431g has three significant figures: the 0 before the decimal period do not count. Only 4, 3, and 1 are signficant figures: three.
3) 1003 g has four significant figures, because the zeros in between the other digits count. So, 1, 0, 0, and 3 are significant figures.
4) 3870 g has three significant figures, because the 0 after the other 3 digits is only to determine the place value of the first three digit. Only 3, 8, and 7 here are significant figures.
Among the provided options, the mass measurement '1003g' contains four significant figures. In significant figure rules, leading zeros are not counted while zeros between non-zero numbers and zeros that come after a non-zero number, in a whole number representation, are significant.
In the context of mass measurement in chemistry, significant figures are crucial as they represent the precision of a measurement. Among the provided options: 0.086g, 1003g, 0.431g, and 3870g, the mass measurement 1003g contains four significant figures.
To clarify, leading zeros (e.g., 0.086g) are not counted as significant figures. In whole numbers, however, trailing zeros are counted as significant figures if they directly follow a non-zero number (e.g., 1003g). Therefore, the mass measurement '1003g' actually has four significant figures: 1, 0, 0, and 3.
However, the trailing zeros in '3870g' are not considered significant as there's no decimal point specified.
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(2) gains an electron
(3) loses a proton
(4) loses an electron
When a lithium atom forms a Li+ ion, the lithium atom looses an electron. Therefore, option 4 is correct.
The elementary electric charge of the electron is a negative one, making it a subatomic particle. Due to their lack of components or substructure, electrons, which are members of the lepton particle family's first generation, are typically regarded to be elementary particles.
Quarks make up protons and neutrons, but not electrons. We believe that quarks and electrons are basic particles that are not composed of lesser subatomic particles.
Three protons and three electrons make up a lithium atom. It may become an ion if one of its electrons is lost. It now has a net positive charge since there are more positive protons than negative electrons. It is a positive ion as a result.
Thus, option 4 is correct.
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Answer:
(4) loses an electron
it has 3 protons and electrons, proton no. cannot change, to make lithium an ion, it needs to have an exact number of electrons so that the electronic shell can be 2, 8… something like that. So lithium atom loses an electron in order to for Li+ ion. Making the electrons to have 2 as an electronic shell.
Answer:
There are 1, 13 moles of chlorine gas.
Explanation:
We apply the formula of the ideal gases, we clear n (number of moles); we use the ideal gas constant R = 0.082 l atm / K mol:
PV= nRT ---> n= PV/RT
n= 0,98 atm x 35,5 L /0,082 l atm / K mol x 373 K
n= 1,137448506 mol
b.284 g
c.710 g
d.178 g
Answer:
mass (g) needed = 710.2 grams Na₂SO₄(s)
Explanation:
Needed is 2.5 Liters of 2.0M Na₂SO₄; formula wt Na₂SO₄ = 142.04g/mol.
mass (grams) of Na₂SO₄(s) = Molarity needed x Volume needed in Liters x Formula Wt of solute
mass (grams) of Na₂SO₄(s) = (2.5L)(2.0M)(142.04g/mol) = 710.2 grams Na₂SO₄(s)
Mixing: Transfer 710.4 grams Na₂SO₄ into mixing vessel and add water-solvent up to but not to exceed 2.5 Liters total volume. Mix until dissolved.
Gives 2.5 Liters of 2.0M Na₂SO₄(aq) solution.