Answer:
7.5×10²³ ions
Explanation:
Given data:
Mass of magnesium sulfate = 75.0 g
Number of ions = ?
Solution:
Number of moles of magnesium sulfate:
Number of moles = mass/molar mass
Number of moles = 75.0 g/ 120.36 g/mol
Number of moles = 0.623 mol
Magnesium sulfate formula: MgSO₄
Number of moles of ions in 1 mole of MgSO₄ = 2 mol (Mg²⁺ and SO₄²⁻)
Number of moles of ion in 0.623 moles of MgSO₄:
2 mole ×0.623 = 1.246 mol
Number of ions:
1 mole contain 6.022×10²³ ions
1.246 mol × 6.022×10²³ ions / 1mol
7.5×10²³ ions
What is the empirical formula for a compound which is composed of 31.9 g of Mg and 27.1 g P?
Answer:
Answer is on the pic
Explanation:
I hope it's helpful!
please help, i have my test today
(a) A carbon atom contains 6 electrons, 7 neutrons and 6 protons.
(i) State the mass number of this carbon atom
Answer:
carbon atoms with the usual 6 neutrons have a mass number of 12 (6 protons + 6 neutrons = 12), so they are called carbon-12. Carbon atoms with 7 neutrons have an atomic mass of 13 (6 protons + 7 neutrons = 13). These atoms are the isotope called carbon-13.
an atom of carbon with six neutrons, carbon-12, has an atomic mass of 12 amu.
Calculate the mass percent of calcium chloride in 1.00g of Calcium Chloride in 19.0 g of water
Answer:
5.26%
Explanation:
Given parameters:
Mass of calcium chloride = 1g
Mass of Water and calcium chloride = 19g
Unknown:
Mass percent of calcium chloride in the water solution = ?
Solution:
To solve this problem, we express the given mass of the calcium chloride as a percentage of the solution.
Mass percent of calcium chloride = [tex]\frac{1}{19}[/tex] x 100 = 5.26%
The mass percentage of calcium chloride is 5.26%
Prove Conservation of Mass
This is the combustion of pentane. How do I prove that there’s a conservation of mass? I can’t find a way to make it add up.
Answer:
2C5H12O+15O2→10CO2+12H2O
Explanation:
To prove the Law of Conservation of Mass, this equation is not balanced. To balance it, you need to show the work to find out how to balance it. To do that, You look at the C’s first and question are they balanced? They aren’t so you add a CO2 and continue that process until it’s balanced for each element.
What would the mass be of a single atom of copper?
Answer:
1
atom of
Cu
has a mass of
1.055
×
10
−
22
g
.
What is the effect of thermal energy on the atoms/molecules in a sample of matter?
Answer:
When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.
Answer:
Explanation:
When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.
What mass of oxygen gas (O 2 ) required to react completely with 2 moles of C 6 H 14 ?
Answer:
608g
Explanation:
This is a combustion reaction between oxygen gas and C₆H₁₄.
The reaction expression is given as:
2C₆H₁₄ + 19O₂ → 12CO₂ + 14H₂O
We have been given 2 moles of C₆H₁₄
Let us find the number of moles of oxygen gas;
2 moles of C₆H₁₄ will react with 19 moles of O₂
Mass of oxygen gas reacting = number of moles x molar mass
molar mass of oxygen gas = 2(16) = 32g/mol
Mass of oxygen gas = 19 x 32 = 608g
edpuzzle
31
MULTIPLE CHOICE QUESTION
+
Which do you think would have a higher (more) density?
Sherry is researching how water from the ocean enters the water cycle. What is the source of energy for the water cycle
Answer:
The sun
Explanation:
The source of energy for the water cycle is the sun. In the solar system, the sun is the ultimate source of energy for the external processes.
The water cycle is powered by the energy from the sun.
When solar radiation impacts the ocean, water is radiated from its surface into the atmosphere. There is a phase change of evaporation that goes in such a procedure. Therefore, addition of energy by the sun causes vaporization. The water is cooled and precipitation occurs within the clouds as the energy gained is being lost.A machine have 75% efficiency,what does it mean.
Answer:
A machine have 75% efficiency means 25% of efficiency has been lost due to friction and a machine can work 75% only.
Give reason
why Iron is not found in a free state?
Answer:
Iron is in nature in the form of its compounds… it is not as a free element.
does this help?
Write the electron configuration for the following elements:
a. carbon
b. neon
c. sulfur
d. lithium
e. argon
f. oxygen
g. potassium
h. helium
Answer:
a.Carbon [He]2s22p2
b. Neon [He]2s22p6
c. Sulfur [Ne]3s23p4
d.Lithium [He]2s1
e. Argon [Ne]3s23p6
f. Oxygen [He]2s22p4
g.Potassium [Ar]4s1
h. Helium 1s2
This table is available to download as a PDF to use as a study sheet.
NUMBER ELEMENT ELECTRON CONFIGURATION
1 Hydrogen 1s1
2 Helium 1s2
3 Lithium [He]2s1
4 Beryllium [He]2s2
5 Boron [He]2s22p1
6 Carbon [He]2s22p2
7 Nitrogen [He]2s22p3
8 Oxygen [He]2s22p4
9 Fluorine [He]2s22p5
10 Neon [He]2s22p6
11 Sodium [Ne]3s1
12 Magnesium [Ne]3s2
13 Aluminum [Ne]3s23p1
14 Silicon [Ne]3s23p2
15 Phosphorus [Ne]3s23p3
16 Sulfur [Ne]3s23p4
17 Chlorine [Ne]3s23p5
18 Argon [Ne]3s23p6
19 Potassium [Ar]4s1
20 Calcium [Ar]4s2
21 Scandium [Ar]3d14s2
22 Titanium [Ar]3d24s2
23 Vanadium [Ar]3d34s2
24 Chromium [Ar]3d54s1
25 Manganese [Ar]3d54s2
26 Iron [Ar]3d64s2
27 Cobalt [Ar]3d74s2
28 Nickel [Ar]3d84s2
29 Copper [Ar]3d104s1
30 Zinc [Ar]3d104s2
31 Gallium [Ar]3d104s24p1
32 Germanium [Ar]3d104s24p2
33 Arsenic [Ar]3d104s24p3
34 Selenium [Ar]3d104s24p4
35 Bromine [Ar]3d104s24p5
36 Krypton [Ar]3d104s24p6
37 Rubidium [Kr]5s1
38 Strontium [Kr]5s2
39 Yttrium [Kr]4d15s2
40 Zirconium [Kr]4d25s2
41 Niobium [Kr]4d45s1
42 Molybdenum [Kr]4d55s1
43 Technetium [Kr]4d55s2
44 Ruthenium [Kr]4d75s1
45 Rhodium [Kr]4d85s1
46 Palladium [Kr]4d10
47 Silver [Kr]4d105s1
48 Cadmium [Kr]4d105s2
49 Indium [Kr]4d105s25p1
50 Tin [Kr]4d105s25p2
51 Antimony [Kr]4d105s25p3
52 Tellurium [Kr]4d105s25p4
53 Iodine [Kr]4d105s25p5
54 Xenon [Kr]4d105s25p6
55 Cesium [Xe]6s1
56 Barium [Xe]6s2
57 Lanthanum [Xe]5d16s2
58 Cerium [Xe]4f15d16s2
59 Praseodymium [Xe]4f36s2
60 Neodymium [Xe]4f46s2
61 Promethium [Xe]4f56s2
62 Samarium [Xe]4f66s2
63 Europium [Xe]4f76s2
64 Gadolinium [Xe]4f75d16s2
65 Terbium [Xe]4f96s2
66 Dysprosium [Xe]4f106s2
67 Holmium [Xe]4f116s2
68 Erbium [Xe]4f126s2
69 Thulium [Xe]4f136s2
70 Ytterbium [Xe]4f146s2
71 Lutetium [Xe]4f145d16s2
72 Hafnium [Xe]4f145d26s2
73 Tantalum [Xe]4f145d36s2
74 Tungsten [Xe]4f145d46s2
75 Rhenium [Xe]4f145d56s2
76 Osmium [Xe]4f145d66s2
77 Iridium [Xe]4f145d76s2
78 Platinum [Xe]4f145d96s1
79 Gold [Xe]4f145d106s1
80 Mercury [Xe]4f145d106s2
81 Thallium [Xe]4f145d106s26p1
82 Lead [Xe]4f145d106s26p2
83 Bismuth [Xe]4f145d106s26p3
84 Polonium [Xe]4f145d106s26p4
85 Astatine [Xe]4f145d106s26p5
86 Radon [Xe]4f145d106s26p6
87 Francium [Rn]7s1
88 Radium [Rn]7s2
89 Actinium [Rn]6d17s2
90 Thorium [Rn]6d27s2
91 Protactinium [Rn]5f26d17s2
92 Uranium [Rn]5f36d17s2
93 Neptunium [Rn]5f46d17s2
94 Plutonium [Rn]5f67s2
95 Americium [Rn]5f77s2
96 Curium [Rn]5f76d17s2
97 Berkelium [Rn]5f97s2
98 Californium [Rn]5f107s2
99 Einsteinium [Rn]5f117s2
100 Fermium [Rn]5f127s2
101 Mendelevium [Rn]5f137s2
102 Nobelium [Rn]5f147s2
103 Lawrencium [Rn]5f147s27p1
104 Rutherfordium [Rn]5f146d27s2
105 Dubnium *[Rn]5f146d37s2
106 Seaborgium *[Rn]5f146d47s2
107 Bohrium *[Rn]5f146d57s2
108 Hassium *[Rn]5f146d67s2
109 Meitnerium *[Rn]5f146d77s2
110 Darmstadtium *[Rn]5f146d97s1
111 Roentgenium *[Rn]5f146d107s1
112 Copernium *[Rn]5f146d107s2
113 Nihonium *[Rn]5f146d107s27p1
114 Flerovium *[Rn]5f146d107s27p2
115 Moscovium *[Rn]5f146d107s27p3
116 Livermorium *[Rn]5f146d107s27p4
117 Tennessine *[Rn]5f146d107s27p5
118 Oganesson *[Rn]5f146d107s27p6
Explanation:
I hope it's help
I NEED HELP! The quarter is ending for me tomorrow and I have to have this in, please help if you can.
Answer:
Medium is the answer
How do deep currents form ???
Answer:
The sinking of large masses of cool water gives rise to the (aka thermohaline circulation), which is derived by density gradients due to variations in the temperature and the salinity. The earth's rotation on its axis also influences deep ocean currents (the high and low tides).
Explanation:
Salinity is the saltiness or amount of salt dissolved in a body of water, called saline water- Dictionary term
Density is the degree of compactness of a substance.- Dictionary term
Hope that helps
A chemical equation is balanced when the number of each type of __________ is the same on both sides of the yield sign.
A.)Compound
B.)Molecule
C.)Formula
D.)Atom
Answer:
D. Atom
Explanation:
Which element is likely to react violently with water?
a) carbon
b) beryllium
c) cesium
d) sulfur
I think the answer is beryllium.
because it's not sulfur or carbon and probably not cesium
Which of the following reactions is an example of a single replacement reaction?
Select one:
a. Fe + CuSO4 --> FeSO4 + Cu
b. H2O --> H2 + O2
c. H2O2 --> H2O + O2
d. Na + Cl --> NaCl
Answer:
A
Explanation:
This is the only reaction where a element is displaced out of a solution and turn a soild, due to it been less reactive than the other causing its displacement The electrochemical series can be used as reference.
how many O atoms are in 4C₆H₁₂O₆
Number of O atoms : 24
Further explanationGiven
C₆H₁₂O₆ compound
Required
Number of atoms
Solution
A molecular formula shows the number of atomic elements in compound.
The empirical formula is the smallest comparison of the atoms
Glucose-C₆H₁₂O₆ is composed of 3 elements, namely C, H, and O.
The number of atoms in a compound can usually be seen from the subscript number after the atom and the reaction coefficient shows the number of molecules
So number of O atoms :
= 4 x 6 = 24 atoms
Which statement is a description of a chemical reaction?
• A solid is dropped into a beaker of liquid and a gas is released.
• Two liquids are mixed in a beaker and a solid form at the bottom of the beaker.
A solid is dropped into a beaker of liquid and an explosion occurs.
What is the difference between the outer shell of sodium and the outer shell of fluorine?
The outer shell (the outermost shell) of Na there is 1 electron while in F there are 7 electrons
Further explanationGiven
Sodium and Fluorine
Required
The outer shell difference
Solution
Sodium (symbol Na) is an element in group 1 (alkaline) which has the atomic number 11
So the electron configuration is: [Ne] 3s¹
Meanwhile, Fluorine (symbol F) is a halogen element (group 17) which has atomic number 9
So the electron configuration is: [He] 2s² 2p⁵
If we look at the electron configurations of these two elements, it shows that the element Na to achieve its stability will release 1 electron in the outer shell so that it has an electron configuration like Ne
Meanwhile, Fluorine will need 1 more electron so it can be stable like Ne
So in the outer shell of Na there is 1 electron while in F there are 7 electrons
what is the formula of Aluminum permanganate
Answer:
Explanation:
Thus the chemical formula for aluminium permanganate is formed by cross exchanging the coefficient of valencies of aluminium and permanganate (with each other). Thus the chemical formula for aluminium permanganate is represented as : Al(MnO4)3.
plz help me . you’re the best!! i’m really confused.
Answer:
3rd one the mass of the protons and neutrons together. The mass number (represented by the letter A) is defined as the total number of protons and neutrons in an atom. Consider the table below, which shows data from the first six elements of the periodic table. Consider the element helium. Its atomic number is 2, so it has two protons in its nucleus
Explanation:
hope this helps have a good night/day :) ❤
Luke's collection has 27 postcards in it than brian's collection. Put togteher, their collections have 135 postcards how many postcards does luke have how many postcards does brian have
Answer:
I. Luke has 81 postcards.
II. Brian has 54 postcards.
Explanation:
Let Luke's collection be L
Let Brian's collection be B
Translating the word problem into an algebraic equation, we have;
L = 27 + B
L + B = 135
Substituting equation 1 into equation 2, we have;
27 + B + B = 135
27 + 2B = 135
2B = 135 - 27
2B = 108
B = 108/2
B = 54
Therefore, Brian has 54 postcards.
To find the value of L;
L = 27 + B
L = 27 + 54
L = 81
Therefore, Luke has 81 postcards
Can O and N form a covalent bond?
Answer: Yes
The bonds between nitrogen and oxygen are covalent bonds made from sharing electron pairs.
Answer:
allimorales is correct
Explanation:
which of the following organisms is not considered a polinator
helppp , I’ll give Brainly
What is the charge that a nitrogen ion will form and explain
Answer:
A nitrogen atom must gain three electrons to have the same number of electrons as an atom of the following noble gas, neon. Thus, a nitrogen atom will form an anion with three more electrons than protons and a charge of 3−. The symbol for the ion is N3−, and it is called a nitride ion.
explain the statement - all bases are not alkalis but all alkalis are bases
Answer:
A substance that neutralizes an acid is a base and that soluble in water is an alkali. However, all bases are not soluble in water. Thus, All alkali are bases but all bases are not alkali.
Explanation:
hope this helps ✌️
The ability of a substance to conduct electricity is called_______
Answer:
Electrical conductivity
Explanation:
Electrical conductivity - A material's ability to conduct electricity
What is this please
Answer:
it's c
Explanation:
convention cells
