Answer:
7.23 x 10^24 atoms
Explanation:
Use Avogadro's number that states that there are 6.022 x 10^23 particles in one mole:
12 mol O x (6.022 x 10^23) atoms = 7.23 x 10^24 atoms
32 g of CH4 react with 128 g of O2, producing 88 g of CO2. How many grams of water are produced?
Answer:
88 g
Explanation:
32 g of CH4 react with 128 g of O2, producing 88 g of CO2.
How many moles are there in 17.6g NaOH?
Answer:
The answer is 39.99711. We assume you are converting between grams NaOH and mole. You can view more details on each measurement unit: molecular weight of NaOH or mol This compound is also known as Sodium Hydroxide.
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.44moles are there in 17.6g NaOH.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. The stoichiometry represents the number of moles.
Mathematically,
number of moles of NaOH =given mass of NaOH÷ molar mass of NaOH
Molar mass of 1 mole of NaOH= 40 g/mol
mass of NaOH= 17.6g
Substituting all the given values in the above equation, we get
number of moles of NaOH = 17.6g ÷ 40 g/mol
number of moles of NaOH =0.44moles
Therefore, 0.44moles are there in 17.6g NaOH.
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In the molar volume of a gas lab, a student
failed to determine the actual volume of
the flask used to collect the gas and
instead used the marking on the flask,
125 ml, as the volume. How will this affect
the student's results?
Answer:
A
Explanation:
what is the atomic number of an atom?
Answer:
The atomic number of an atom is the number of protons in the nucleus or the number of electrons in a neutral atom
Explanation:
Which set of data is more precise?
O 1, 2, 1, 2
O 1,1.5, 1.5, 1
O 0.5, 1, 2,1.5
O 1, 2, 2, 1.5
Answer:
01,1.5,1.5,1
Explanation:
How much carbon dioxide will be formed if 12.5 grams of oxygen reacts with 7.2 grams of propane?
Answer:66 grams of Carbon Dioxide.
Explanation:
The common currency of chemistry is moles. So it is necessary to change the mass of propane to moles. Then write a balance equation so the moles of propane to moles of Carbon Dioxide. Finally moles of Carbon Dioxide must be changed to grams.
C 3 H 8 + 5 O 2 = =3 C O 2 + 4 H 2 O
This is the balance equation for the burning of propane in Oxygen.
From the equation it can be seen that 1 mole of propane makes 3 moles of Carbon Dioxide a ratio of 1:3
Convert 22 grams of propane to moles by dividing by the molar mass of propane.
3 x 12 = 36 grams
1 x 8 = + 8 grams
total = 44 grams/ mole.
22
44
= .5 moles of propane.
Using the ratio of 1:3 .5 = 3( .5) = 1.5 moles of Carbon Dioxide.
Now multiply 1.5 moles of Carbon Dioxide by the molar mass of Carbon Dioxide
1 x 12 = 12 grams
2 x 16 = +32 grams
total = 44 grams /mole.
1.5 moles x 44 grams/mole = 66 grams.
hope that helps :)
what element has the same number of valence electrons as argon
Answer: There are two elements actually and those elements are Carbon and Silicon
Explanation:Plz mark brainliest if im right
Which of these human development stages occurs after childhood?
1. infancy
2. adulthood
3. maturation
4. adolescence
Answer:
4 Adolescence
Explanation:
Adolescence is the human development stages occurs after childhood. Hence option 4 is correct.
What is human development?Human development is defined as expanding people's freedoms and opportunities while also enhancing their well-being. The true freedom that everyday individuals have to choose who they are, what they do, and how to live is what human growth is all about. This discipline tries to comprehend the numerous transformations that people and their relationships go through as they learn and develop.
The youngster reaches puberty during the adolescent stage. A abrupt rise in hormones causes a variety of emotional and mental changes throughout this time. The body's major and secondary sex traits develop during a significant growth spurt phase.
Thus, adolescence is the human development stages occurs after childhood. Hence option 4 is correct.
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4.91 M NaOH solution (density=1.04g/ mL)
Im dum.b help
When a grasshopper egg hatches, a baby grasshopper called a pupa comes out of the egg and begins to grow. Although the nymph grasshopper already looks like a grasshopper, it still needs to molt its exoskeleton many times before becoming a full-grown adult."
Which statement corrects the error in the passage?
Question 3 options:
A baby grasshopper is a larva.
A baby grasshopper is a nymph.
The grasshopper nymph hatches.
The nymph has no exoskeleton.
Answer:
2.A baby grasshoper is a nymph.
Explanation:
Answer:
yourinagenjitsulol
Expert
75 answers
3.6K people helped
Answer:
2.A baby grasshopper is a nymph.
Explanation:
i agree
A company uses chlorine to produce titanium chloride from titanium dioxide.
What is the relative formula mass (Mr) of titanium dioxide, TiO2?
Relative atomic masses (Ar): O = 16 Ti = 48 *
Answer:
80 g/mol
Explanation:
The Relative formular mass is the sum of the relative atomic masses of the elements present in the molecule.
TiO2;
There is one Ti atom and 2 O atom. Their atomic masses is given as;
TiO2 = 48 + 2(16) = 48 + 32 = 80 g/mol
how many moles are in 32.3g of calcium phosphate
Answer: the formula mass of calcium phosphate [Ca3(PO4)2] is 310.177 amu, so its molar mass is 310.177 g/mol. This is the mass of calcium phosphate that contains 6.022 × 1023 formula units.
Answer: 310.177
(25 POINTS AND BRAINLIEST)What is the volume of 2 mol of chlorine gas at STP?
2.0 L
11.2 L
22.4 L
44.8 L
Answer:
44.8
Explanation:
According to standard temperature and pressure and ideal gas equation , the volume of 2 mole of chlorine gas at STP is 44.8 liters.
What are standard temperature and pressure conditions?Standard temperature and pressure are defined as a standard set of conditions required for experimental measurements which are established to allow comparison between different sets of data.
Standards which are commonly used are those International Union of pure and applied chemistry and national institute of standards and technology.These are not universally accepted standards but are the ones which are commonly used.
Standard conditions of pressure and temperature are necessary to define standard reference conditions used to express volumes of liquids and gases.
These values are important to physicists, chemists ,engineers ,pilots and navigators.On substituting values in ideal gas equation, volume= 2×8.314×273/1=44.8 liters.
Thus, the volume of 2 mole of chlorine gas at STP is 44.8 liters.
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Which plant structures are common to all angiosperms?
spores
flowers
cones
endoskeleton
Answer:
B
Explanation:
Ground water, the largest source of fresh water, is stored in bodies of rock and or sediment
a. porosity
b. sediment
c. particles
d. aquifers
i dont even know what this means
Answer:
particles
Explanation:
oof oof oof oof oof oof oof
HELP !!!!!!!!!!!!! PLEEEAAAAASSSSSSEEEE
Home can use ____to distribute warm air from a sunroom
Answer:
Solarpannels? I honestly don't know I'm just trying to be helpful.
You do an experiment in which you need 0.25 mole of tyrosine (C,H11 NO3).
How many grams must you weigh out?
A). 45.3 g
B). 90.5 g
C). 181 g
D). 272 g
Answer:
B.90.5 g
Explanation:
not 100%sure hehe
Answer:
45.3
Explanation:
I got it wrong on my test and this was the only correct option for me.
how many grams are in 7.4 moles of HgS?
Answer: 1721.6 grams
Explanation:
Gas
% of Volume
7.
N
78
Oz
21
Ar
.9
CO2
.04
Ne
1.0018
He
.00052
CHA
.00017
Kr
.00011
H2
.00006
Using the chart above, which gases make up the majority of the Earth's atmosphere?
HELP ASAP
Answer:
this would be the .04 it is very simple
Explanation:
What is the density of a 32g toy car that
has a volume of 8cm3?
A. 256alcm3
An3
Answer:
density=mass/volume
density=32/8
density=4
(Popcorn Stand) A salt shaker has 2.91 moles of NaCl, how many grams of NaCl are in the salt shaker?
Answer:
170 grams NaCl
Explanation:
Find the mass of NaCl by adding the two elements atomic mass
Na: 22.99
Cl: 35.45
22.99+35.45=58.44 g
Convert moles to grams.
2.91 mol NaCl * 58.44 g NaCl= 170.0604 g
Which substance contains positive ions immersed in a sea of mobile electrons?
a. O2 (s)
b. CuO (s)
c. Ag (s)
d. SiO2 (s)
The substance, silver (Ag), we can see positive ions immersed in a sea of mobile electrons.
What is metallic bond?The term metallic bond refers to the bonding between metal atoms. This bonding consists of positively charged ions and a sea of electrons bonded together electrostatically.
Hence, in the substance, silver (Ag), we can see positive ions immersed in a sea of mobile electrons.
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what is the formula mass of MgO (how much does one mole of it weigh)
Answer:
40.3044 g/mol
Explanation:
hope this helps
HNO3 + KOH → ____ + _____
Answer:
HNO3 + KOH → _KNO3___ + __H2O___
Explanation:
It's balanced
hope it helps
How does environmental changes affect animals?
Environmental changes affect animals depending on their ability to adapt to new conditions.
What is adaptation?An adaptation is any type of phenotypic feature associated with a higher fitness in a particular environment.
Adaptations are features that allow organisms to adapt to challenging environmental conditions.
In conclusion, environmental changes affect animals depending on their ability to adapt to new conditions.
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Which of the situations below describes an ethical dilemma related to food
engineering?
Answer:
Pesticides protect our crops
Explanation:
During spontaneous fission, a nucleus of 25498Cf can produce 11846Pd, four neutrons, and what other nuclide?
Answer: 52Te - Tellurium
Explanation: Radioactivity occurs when an unstable nucleus of an element decompose into a stable element by emitting particles or forms of eletromagnetic energy. There are types of radioactivity and Spontaneous Fission is one of them.
In Spontaneous Fission, the unstable, also called parent, nucleus splits into two smaller nuclei and emitts one or more neutrons.
The reaction spontaneous fission of Cf is represented below.
25498Cf ⇒ 11846Pd + 4n + X
The characteristics of each element of the equation are:
1) The element Cf has atomic mass 254 and atomic number 98.
2) Element Pd has atomic mass 118 and atomic number 46.
3) Neutron is represented as n, has no atomic number and atomic mass 1.
Given these properties, to determine the other nuclide, we have to find out the nuclide's atomic number, as each element in the periodic table has its own atomic number.
At the left side of the equation, atomic number is 98. At the right side, element X's atomic number is
98 - 46 + 0 = 52
In the periodic table, the element with atomic number 52 is Tellurium, whose symbol is Te.
The other nuclide for the spontaneous fission is Tellurium (Te).
What is the mass of 3.00x10^23 particles of water? Water has a molar mass of 18.0 g/mol.
8.97 g H₂O
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
3.00 × 10²³ particles H₂O
Step 2: Identify Conversions
Avogadro's Number
[Given] Molar Mass of H₂O - 18.0 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 3.00 \cdot 10^{23} \ particles \ H_2O(\frac{1 \ mol \ H_2O}{6.022 \cdot 10^{23} \ particles \ H_2O})(\frac{18.0 \ g \ H_2O}{1 \ mol \ H_2O})[/tex]Multiply/Divide: [tex]\displaystyle 8.96712 \ g \ H_2O[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
8.96712 g H₂O ≈ 8.97 g H₂O
How does energy play a role in different rock types forming? I had this question another time in my test and it's asking the same thing again.
Answer:
Yes
Explanation:
Yes, there are many energy forces that directly affect the formation of rocks and other substances. The Sun itself provides both energies in the form of heat/radiation and magnetic energy. Heat can get so intense when combined with pressure from being so far underground that it causes rocks to melt and become magma, which combines with other minerals and forms new types of rocks when they cool in the future. Magnetic energy helps push and pull the waves and wind on Earth which ultimately break down rocks into sand over the years.