Answer:
Molecular formula = C₂H₆
Explanation:
Given data:
Percentage of hydrogen = 20.0 %
Percentage of carbon = 80.0 %
Molar mass = 30.0 g
Empirical formula = ?
Solution:
Number of gram atoms of H = 20 / 1.01 = 19.8
Number of gram atoms of C = 80 /12 = 6.7
Atomic ratio:
C : H
6.7/6.7 : 19.8/6.7
1 : 3
C : H = 1 : 3
Empirical formula is CH₃.
Molecular formula:
Molecular formula = n (empirical formula)
n = molar mass of compound / empirical formula mass
Empirical formula = CH₃ = 12×1 +3×1.01 = 15.03 g/mol
n = 30 g/mol / 15.03 g/mol
n = 2
Molecular formula = n (empirical formula)
Molecular formula = 2 (CH₃)
Molecular formula = C₂H₆
3. If all the waves were measured for a period of 5 seconds, which wave had the highest frequency?
Answer:
Correct answer is A.
Explanation:
Frequency is the number of oscillations that a wave have per unit time. Since time is measured in seconds, the wave with the highest frequency must register the highest number of oscillation per second. Hence, correct answer is A.
If atoms contain charged particles, why do they not have a charge?
A.They contain the same number of protons as electrons
B.The charge is locked away in the nucleus
C.They contain equal numbers of protons and neutrons
Answer:
A
Explanation:
They have the same number of positive protons & negative electrons, hope this helps
13. a. Why are the units used to express the densi-
ties of gases different from those used to
express the densities of solids or liquids?
Answer with Explanation:
The units used to express the densities of gases are different from those of solids and liquids because the particles in gas are widely separated from each other, unlike the particles in solid and liquid which are almost the same. The particles in solid are very close together. Considering it melts (if it's an ice), it will turn into a liquid and the change in volume is slightly greater only. However, if the liquid evaporates and transitions into a gas, the volume becomes largely different from its solid and liquid state. This is because the particles are much farther apart and free to move.
What is this and explain why please:)
Answer:
C Atomic number
Explanation:
The question is typo it should be 19 is the____ of pottasium. The atomic number is the number on top
CH4 + 202 → CO2 + 2H2O
How many moles of O2 needed to react with 32 grams of CH4?
4.0 mol O₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional Analysis Explanation:Step 1: Define
[RxN - Balanced] CH₄ + 2O₂ → CO₂ + 2H₂O
[Given] 32 g CH₄
Step 2: Identify Conversions
[RxN] 1 mol CH₄ → 2 mol O₂
Molar Mass of C - 12.01 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of CH₄ - 12.01 + 4(1.01) = 16.05 g/mol
Step 3: Stoichiometry
Set up conversion: [tex]\displaystyle 32 \ g \ CH_4(\frac{1 \ mol \ CH_4}{16.05 \ g \ CH_4})(\frac{2 \ mol \ O_2}{1 \ mol \ CH_4})[/tex]Divide/Multiply: [tex]\displaystyle 3.98754 \ mol \ O_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
3.98754 mol O₂ ≈ 4.0 mol O₂
How many moles are represented by 9.34 x 1021 sodium atoms
a. 1.25x10^2 moles
b. 1.55x10^3 moles
c. 1.55x10^2 moles
d. 1.55 moles
Answer:
1.55×10⁻² moles of sodium
Explanation:
Given data:
Number of atoms of sodium = 9.34×10²¹ atoms
Number of moles of sodium = ?
Solution:
Avogadro number:
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
9.34×10²¹ atoms × 1 mol / 6.022 × 10²³ atoms
1.55×10⁻² mol
How does soil affect groundwater?
HELP I WILL mark brainliest
Answer:
1 Hour...
Explanation:
If It’s 960 Km/h, then it will take 1 hour to fly there.
which element would lose electrons during ionic bonding choose all that apply
mg
li
ca
cs
Answer:
All of them!
Explanation:
Since Mg, Li, Ca, and Cs are all in groups 1 and 2 of the periodic table, they are alkali/alkaline earth metals and will all lose electrons during ionic bonding.
Seawater is 3.5% Sodium Chloride by mass. Sea Salt can contain about 10 % water.
How much water is removed from every Kilogram of Commercial Sea Salt?
10g water is removed from every Kilogram of Commercial Sea Salt
Answer:
900 g
Explanation:
90% of 1000 g is 900g
____ are compounds that contain only hydrogen and carbon.
Select one:
a. Hydrocarbons
b. Acidic molecules
c. Polar molecules
d. Water
Answer:
a. hydrocarbons is the answer
Answer:
a.Hydrocarbons
Explanation:
Compounds that contain only carbon and hydrogen are known as hydrocarbons. Those that contain as many hydrogen atoms as possible are said to be saturated. The saturated hydrocarbons are also known as alkanes.
candy0993 please answer me
Answer:
hi this is candy0993
Explanation:
do you need something?
What is the change in velocity if the final velocity is 80 mph and the initial velocity is 20 mph? Is the object speeding up or slowing down?
Answer:
60mph
Explanation:
Not completely sure??
Seth used this model to show how water vapor becomes a liquid in the water cycle. Which part of the water cycle is he modeling?
Answer: He is modeling the condensation process in the water cycle.
During basketball practice Joel runs 500 meters in 25 seconds towards the baskeball goal.
What is his velocity(speed)?
Answer:
He runs 20 meters per second
Explanation:
500÷25=20
Hopes this helps :)
Answer:
[tex]v = \frac{d}{t} \\ \frac{500}{ 25} \\ 20m {s}^{ - 1} [/tex]
How can you tell one element from another?
help me plz ty:}
What is the number of atoms in the reactants?
What is the number of atoms in the product?
Answer:The law of conservation of matter says that matter cannot be created or destroyed. In chemical equations, the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products. if those are answers? i cant be sure but sorry
Explanation:
Answer:
4 reactants and 4 product
Explanation:
2 mg atoms and 2 o atoms = 2 mgo
pls solve.............................................
Answer:
Element A is pottassium an alkali metal
Element B is a noble gas
Element C is bromine I think which is a halogen
Element D is lithium I think...or some other from group 2 or 1
I NEED HELP! The quarter is ending for me tomorrow and I have to have this in, please help if you can.
Answer:
The answer is B
Identify each of the following as an element, a compound, a homogeneous mixture, or a heterogeneous mixture:
Explanation:
An element is a distinct substance that cannot be split-up into simpler substances. Such substances are only made up of one kind of atom.
A compound is composed of two or more kinds of atoms joined together in a definite grouping.
A homogenous mixture is a mixture in which its constituents exists in just one phase.
A heterogeneous mixture is one whose constituents exists in at least two different phases.
S₈ is a compound
CH₄ is a compound
Salt water is a homogenous mixture
Distilled water is a compound
CH₂O is a compound
Concrete is a heterogenous mixture.
antimony hexachloride formula
What is the first step in the environmental policy process?
Identify the problem
identify specific causes of the problem
Envision a solution and set goals
Get organized
What is the smallest substance?
A. mixture
B. atom
C. compound
Answer:I believe it is B. Atom,
Explanation:
Answer:
B. Atom
Explanation:
Compounds and mixtures are to big compared to an atom.
Which statement below is the most accurate description of the location of subatomic particles?
The protons and electrons are located in the nucleus, while the neutrons are located in a cloud outside the nucleus
The protons and electrons are located in the nucleus, while the neutrons are located in a cloud outside the nucleus
The neutrons and electrons are located in the nucleus, while the protons are located in a cloud outside the nucleus.
The neutrons and electrons are located in the nucleus, while the protons are located in a cloud outside the nucleus.
The electrons are located in the nucleus, while the protons are neutrons are located in a cloud outside the nucleus.
The electrons are located in the nucleus, while the protons are neutrons are located in a cloud outside the nucleus.
The protons and neutrons are located in the nucleus, while the electrons are located in a cloud outside the nu
Answer:
the last one is correct
Explanation:
Answer: The protons and neutrons are located in the nucleus, while the electrons are located in a cloud outside the nu
Explanation: The protons and neutrons are located in the nucleus, while the electrons are located in a cloud outside the nu
It is hard to identify a _____ strictly by color because many of them look so much alike.
Answer:
Mineral
Explanation:
Many minerals share the same colors so it would be one of the least important parts of mineral identification
How many liters of O2 at STP will react with 8.7 grams of C2H4 to form CO2 and H2O?
C2H4 + 3 O2 -------> 2 CO2 + 2 H2O
Pls help
answers can be
21
22
2.3
The volume of O₂ : 21 L
Further explanationGiven
8.7 grams of C₂H₄
Required
Volume O₂
Solution
Reaction
C₂H₄ + 3 O₂ ⇒ 2 CO₂ + 2 H₂O
mol C₂H₄(MW= 28 g/mol) :
= mass : MW
= 8.7 g : 28 g/mol
= 0.311
From the equation, mol O₂ :
= 3/1 x mol C₂H₄
= 3/1 x 0.311
= 0.933
At STP, 1 mol gas=22.4 L, so for 0.933 mol :
= 0.933 x 22.4 L
= 20.899 L ≈ 21 L
What is the theoretical yield of Ca(OH)2, in grams, if 31.8 g of CaO is hydrolyzed (reacted) in an excess of water?
The theoretical yield of Ca(OH)₂ : 42.032 g
Further explanationGiven
31.8 g of CaO
Required
The theoretical yield of Ca(OH)₂
Solution
Reaction
CaO + H₂O⇒Ca(OH)₂
mol CaO (MW=56 g/mol) :
= mass : MW
= 31.8 g : 56 g/mol
= 0.568
From equation, mol Ca(OH)₂ = mol CaO = 0.568
Mass Ca(OH)₂ (MW=74 g/mol) :
= 0.568 x 74
= 42.032 g
please help me will mark brainliest
Answer:
accretion
Explanation:
the coming together and cohesion of matter under the influence of gravitation to form larger bodies.
What is world elevation
Explanation:
Online access to standardized measurement sets, multi-source street view, or digital surface modeling is offered by World Elevation networks. The platforms include a specific example of elevation data and derivative items for mobile apps to use
why do minerals only form in certain areas? please answer this seriously-
Answer:
The chemicals in the surrounding area can make it harder for minerals to form.
Hope I helped:)
