Answer:
1.99M
Explanation:
Molality can be calculated by dividing the moles of solute by the mass of the solvent i.e.
Molality (M) = n of solute (mol) ÷ mass of solvent (kg)
Based on the information, mass of HCl (solute) = 18.2g, mass of solvent (water) = 250.0g
mole of solute = mass/molar mass
Molar mass of HCl = 1 + 35.5 = 36.5g/lol
mole = 18.2/36.5
mole = 0.499mol
Mass of solvent = 250.0g
In Kg, mass of water = 250/1000
= 0.250Kg
Molality = 0.499/0.250
Molality = 1.996
Molality of the solution = 1.99M
How many molecules are in 32.4 L KOH?
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N2 + 3 H2 – 2 NH3 How many moles of nitrogen (N2) are required to get 6
moles of ammonia (NH3)? *
Answer:
N2 + 3H2 → 2NH3. 14 moles a. If 6 mol of H2 are consumed, how many moles of NH3 are produced? ... a 3 mol H₂. 4. How many moles of nitrogen are needed to make 11 moles of NH3? Il mol NH₃ x Imol Na = 15.5
khan academy sucks. can someone answer this? :)
Which of the following elements will have its valence electrons represented in figure B?
A. Boron
B. Phosphorus
C. Chlorine
D. Manganese
Answer:
Answer is B
Explanation:
Which of the following is a neutralization reaction?
a
SiCl4 + 4 H2O → H4SiO4 + 4 HC
b
HCl + NaOH → NaCl + H2O
c
6 CO2 + 6 H2O → C6H12O6 + 6 O2
d
2Al + 6HCl → 2AlCl3 + 3H2
Answer:
B
Explanation:
B, Hcl + NaoH = NaCl + H2O
Which statement is true about solids?
Their particles can flow over one another, so they have a fixed volume but no fixed shape.
Their motionless particles are packed together in a fixed arrangement.
Their vibrating particles are packed together in relatively fixed positions.
Their fast-moving particles can expand to take the shape of their container.
Answer:
3
Explanation:
Answer:
Their vibrating particles are packed together in relatively fixed positions.
Explanation:
As you can see in the image below, solid is packed together.
I am so lost. Does anyone know how to do this??? Enthalpies of reaction stuff
C2H4(g)+3O2(g)→2CO2(g)+2H2O(l) ΔH∘1=?
The combustion of C2H4(g) is represented by the equation above.
(a) Use the enthalpies of formation in the table below to calculate the value of ΔH∘1 for the reaction.
ΔH∘f(kJ/mol)
C2H4(g) 52
CO2(g) −394
H2O(l) −286
O2(g) 0
Please help!!! :(
Answer:
-1464 kJ/mol
Explanation:
The balanced equation for the reaction is given as;
C2H4(g)+3O2(g)→2CO2(g)+2H2O(l) ΔH∘1=?
The enthalpy of the reaction is given by the equation;
Enthalpy of reaction = Enthalpy of products - Enthalpy of reactants
Products:
2CO2(g)+2H2O(l)
Enthalpy of Products = 2 (−394) + 2(−286)
Enthalpy of Products = -1360 kJ/mol
Reactants:
C2H4(g)+3O2(g)
Enthalpy of Reactants = 2 (52) + 3(0)
Enthalpy of Reactants = 104 kJ/mol
Enthalpy of Reaction = -1360 - 104 = -1464 kJ/mol
I need help with the balancing one
Answer:
2Na2S + Cd(NO3)2 ---> CdS + 2NaNO3
The coefficients therefore are 1,1,1&2
__Is when water changes from a solid to a liquid
When water changes from a solid to a liquid it is called melting.
Solid ice melts and forms into a liquid: water.
If this incorrect, please, don't refrain to tell me. Thank you.
1. Calculate the mass of alumina (A1203) produced when 250 g of aluminum burns in oxygen.
Answer:
4Al + 3O2 ------> 2Al2O3
the mole ratio is 4:2
you divide 250 by 2
you get 125 and that's the mass produced
Select the compound that is soluble in water?
Answer:
NaOH
Explanation:
NaOH is among the water soluble bases
A forecaster studying the climate of an area would find which of the following most helpful?
A. average yearly precipitation
B. today's barometric pressure
C. temperature changes in one month
D. how often natural disasters occur
A forecaster studying the climate of an area would find average yearly precipitation most helpful.
What is forecaster studying of climate?Forecaster studying of climate tells about the changes which will occur in the atmosphere in the upcoming future time.
Forecasting is done by measuring various environmental factors for the prediction of atmosphere. As it will given information about the percent of rainfall in the upcoming days, amount of precipitation, snowfall and so on.
Hence, option (A) is correct.
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Can someone please help me with this I’ll mark brainliest
Answer:
for instance when you exercise your muscles increase heat production nudging your body temperature upward.
similarly when you drink a glass of fruit juice your blood glucose goes up
homeostasis depends on that ability of your body to detect and oppose these changes
Why is vapor pressure higher in oil than water if water has stronger IMF’s?
Answer:
A liquid's vapor pressure is directly related to the intermolecular forces present between its molecules. The stronger these forces, the lower the rate of evaporation and the lower the vapor pressure.
Explanation:
Answer:
vapor is bad it is the worst thing
A particle of matter contains six protons seven neutrons and six electrons the particle must be
Which is the correct answer?
Plz answer question! Due in 7 minutes!!! Will make BRAINLIEST for first correct answer!!!
Mg + 2HCl ⟶ MgCl2 + H2
If 2.26 moles of HCl are reacted, how many grams of magnesium were used in the reaction?
Answer: m = 24.31 g/mol · 1.13 mol
Explanation: 2 mol HCl use 1 mol Mg.
Magnesium is used 0.5 · 2.26 mol = 1.13 mol
M(Mg) = 24.31 g/ mol
27.50 grams of magnesium were used in the reaction.
What is magnesium ?Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a shiny gray metal that is relatively soft and lightweight. Magnesium is the eighth most abundant element in the Earth's crust and is found in minerals such as magnesite and dolomite.
The balanced chemical equation is: Mg + 2HCl ⟶ MgCl2 + H2. From the equation, we can see that one mole of magnesium reacts with 2 moles of hydrochloric acid to produce one mole of magnesium chloride and one mole of hydrogen gas.
We are given 2.26 moles of hydrochloric acid, which means that we need half as many moles of magnesium to react with it. So: moles of Mg = 2.26/2 = 1.13
Now we can use the molar mass of magnesium (24.31 g/mol) to calculate the mass of magnesium used in the reaction:
mass of Mg = moles of Mg x molar mass of Mg
mass of Mg = 1.13 mol x 24.31 g/mol
mass of Mg = 27.50 g
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What is the chemical name for CO?
Answer:
Carbon monoxide, (CO), a highly toxic, colourless, odourless, flammable gas produced industrially for use in the manufacture of numerous organic and inorganic chemical products; it is also present in the exhaust gases of internal-combustion engines and furnaces as a result of incomplete conversion of carbon or carbon
Explanation:
Answer:
why joy deleting my answer
Explanation:
explain how rain gauge measures the amount of rainfall
A rain gauge is really just a cylinder that catches rain. If an inch collects in the cylinder, it means an inch of rain has fallen. It's that simple. Most standard rain gauges have a wide funnel leading into the cylinder and are calibrated so that one-tenth of an inch of rain measures one inch when it collects inside.
CaC2 + 2H2O ⟶ C2H2 + Ca(OH)2
If 32.0g CaC2 are used in this reaction, how many moles of calcium hydroxide are produced?
0.499 mol
Explanation: M(CaC2) = 64.1 g/mol, n= m/M = 32.0 g/ 64.1 g/ mol= 0.499 mol
Amount of Calcium hydroxide Is same
In the reaction Cu + 2Ag
-->
Cu2+ + 2Ag, the oxidizing agent is
1.Ag+
2.Ag
3.Cu2+
4.Cu
Answer:
Cu2+
Explanation:
1. What is an air mass? 2. What 2 factors characterize an air mass? 3. What determines the two characteristics of an air mass? 4. What would a cold and wet air mass be called? 5. What would a warm and dry air mass be called? 6. What type of air mass do you think would form over Canada? 7. What kind of weather is associated with a cold front? 8. What kind of weather is associated with a warm front? 9. What symbol on a map represents a warm front? 10. What symbol on a map represents a cold front? 11. What type of weather is associated with a stationary front? 12. How does an occluded front form? 13. What kind of weather can an occluded front bring? 14. What is the symbol on a map to show an occluded front?
Answer:
1. a body of air with horizontally uniform temperature, humidity, and pressure.
2. Boundaries between unlike air masses. Air masses have fairly uniform temperature and moisture content in horizontal direction (but not uniform in vertical). Air masses are characterized by their temperature and humidity properties.
3. Air masses have fairly uniform temperature and moisture content in horizontal direction (but not uniform in vertical). Air masses are characterized by their temperature and humidity properties.
4. Continental air masses are characterized by dry air near the surface while maritime air masses are moist. Polar air masses are characterized by cold air near the surface while tropical air masses are warm or hot.
5. Continental air masses form over land and are dry. Therefore, an air mass that develops over northern Canada is called a continental polar air mass and is cold and dry. One that forms over the Indian Ocean is called a maritime tropical air mass and is warm and humid.
6. an air mass that develops over northern Canada is called a continental polar air mass and is cold and dry.
7. Commonly, when the cold front is passing, winds become gusty; there is a sudden drop in temperature, and heavy rain, sometimes with hail, thunder, and lightning.
8. stormy
9. The symbol that is used to identify a cold front on a weather map is a blue line with triangles that point in the direction in which the cold front is moving. The line is represents the leading edge of the cooler air mass.
10. The symbol that is used to identify a cold front on a weather map is a blue line with triangles that point in the direction in which the cold front is moving. The line is represents the leading edge of the cooler air mass
11. Because a stationary front marks the boundary between two air masses, there are often differences in air temperature and wind on opposite sides of it. The weather is often cloudy along a stationary front, and rain or snow often falls, especially if the front is in an area of low atmospheric pressure.
12. At an occluded front, the cold air mass from the cold front meets the cool air that was ahead of the warm front. The warm air rises as these air masses come together. Occluded fronts usually form around areas of low atmospheric pressure.
13. The temperature drops as the warm air mass is occluded, or “cut off,” from the ground and pushed upward. Such fronts can bring strong winds and heavy precipitation. Occluded fronts usually form around mature low pressure areas.
14.An occluded front is a combination of those two signs. They are indicated on a weather map either by a purple line with alternating semicircles and triangles pointing in direction of travel, or by red semicircles and blue triangles pointing in the same direction.
Explanation:
:)
Answer:
Heya
Explanation:
1) air mass:- An air mass is a large volume of air in the atmosphere that is mostly uniform in temperature and moisture.
2) Air masses are characterized by their temperature and humidity properties.
3) ( same answer i.e. temperature and humidity properties).
4) Colder air masses are termed polar or arctic, while warmer air masses are deemed tropical. Continental and superior air masses are dry while maritime and monsoon air masses are moist. Weather fronts separate air masses with different density (temperature or moisture) characteristics.
5) Continental air masses are characterized by dry air near the surface while maritime air masses are moist. Polar air masses are characterized by cold air near the surface while tropical air masses are warm or hot. Arctic air masses are extremely cold.
6) Maritime air masses form over water and are humid. Continental air masses form over land and are dry. Therefore, an air mass that develops over northern Canada is called a continental polar air mass and is cold and dry.
7) Commonly, when the cold front is passing, winds become gusty; there is a sudden drop in temperature, and heavy rain, sometimes with hail, thunder, and lightning. Lifted warm air ahead of the front produces cumulus or cumulonimbus clouds and thunderstorms.
8) Warm fronts often bring stormy weather as the warm air mass at the surface rises above the cool air mass, making clouds and storms. Warm fronts move more slowly than cold fronts because it is more difficult for the warm air to push the cold, dense air across the Earth's surface.
9) The symbol that is used to identify a warm front on a weather map is a red line with half circles that point in the direction in which the warm front is moving. The line represents the leading edge of the warmer air mass.
10) On weather maps, the surface position of the cold front is marked with the symbol of a blue line of triangles/spikes (pips) pointing in the direction of travel.
11) Because a stationary front marks the boundary between two air masses, there are often differences in air temperature and wind on opposite sides of it. The weather is often cloudy along a stationary front, and rain or snow often falls, especially if the front is in an area of low atmospheric pressure.
12)At an occluded front, the cold air mass from the cold front meets the cool air that was ahead of the warm front. The warm air rises as these air masses come together. Occluded fronts usually form around areas of low atmospheric pressure.
13) The warm air mass rises as the cool air masses push and meet in the middle. The temperature drops as the warm air mass is occluded, or “cut off,” from the ground and pushed upward. Such fronts can bring strong winds and heavy precipitation. Occluded fronts usually form around mature low pressure areas.
14)Occluded fronts are drawn as a solid purple line with half circles and triangles pointing in the direction that the front is moving. An occluded front usually brings dry air.
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solubility of gas solutes in water as temperature increases such as CO2 or O2 gas and explain why using the collision theory.
Answer:
See explanation
Explanation:
When a substance is heated, its average kinetic energy increases as the molecules move faster owing to the supply of energy. The solvent molecules are able to collide more frequently with the solute molecules and dislodge them so that the solute can dissolve in the solvent.
However, when a gaseous solute is dissolved in a liquid; as the temperature is increased and solvent molecules are able to collide more frequently with the solute molecules and dislodge them, gas molecules dissolved in the liquid are more likely to escape to the gas phase and not return due to the increase in their kinetic energy.
Hence, solubility of gas solutes in water decreases as temperature increases.
Which of the following identifies the models that represent an ion and an isotope of the original atom?
A)Model 1 is an ion; Model 3 is an isotope
B)Model 2 is an isotope; Model 3 is an ion
C)Model 1 is an ion; Model 2 is an isotope
D)Model 1 is an isotope; Model 2 is an ion
Model 1 is an ion; Model 3 is an isotope identifies the models that represent an ion and an isotope of the original atom. Therefore, option A is correct.
What are isotope ?Isotopes are atoms that have the same number of protons but different numbers of neutrons. They have nearly identical chemical properties but differ in mass and thus in physical properties.
Neutrons exist to stabilize the nucleus without them, the nucleus would be nothing more than a cluster of positively charged protons. There are different isotopes because there are different ways of stabilizing the protons.
Model 1 is an ion and Model 3 is an isotope identifies the models that represent an ion and an isotope of the original atom. The image of the model is attached below:
Thus, option A is correct.
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Why are all molecules not compounds?
Answer:
Explanation:
All compounds are molecules, but not all molecules are compounds. That is because a molecule can be made up of two atoms of the same kind, as when two oxygen atoms bind together to make an oxygen molecule. However, all compounds are made up of two or more different types of atoms.
Answer:
the last one
Explanation:
Which ones are alcohols?
2NO (g) + O2 (g) →2NO2 (g) At equilibrium [NO] = 2.4 × 10 -3 M, [O2] = 1.4 × 10 -4 M, and [NO2] = 0.95 M.
Answer:
[tex]K=1.12x10^9[/tex]
Explanation:
Hello there!
Unfortunately, the question is not given in the question; however, it is possible for us to compute the equilibrium constant as the problem is providing the concentrations at equilibrium. Thus, we first set up the equilibrium expression as products/reactants:
[tex]K=\frac{[NO_2]^2}{[NO]^2[O_2]}[/tex]
Then, we plug in the concentrations at equilibrium to obtain the equilibrium constant as follows:
[tex]K=\frac{(0.95)^2}{(0.0024)^2(0.00014)}\\\\K=1.12x10^9[/tex]
In addition, we can infer this is a reaction that predominantly tends to the product (NO2) as K>>>>1.
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Which is which, acid or base?
Answer:
HCI - BASE
KOH - ACID
H2SO4 - ACID
H30 + :- BASE
NAOH - ACID
Indica en cuál de estos movimientos existe aceleración: Una bicicleta baja por una pendiente y se accionan los frenos. Un caballo galopa durante 2 min a 30 km/h. Una atleta corre desde la línea de salida y se detiene al llegar a la meta
Answer:
1. Hay aceleración.
2. No hay aceleración.
3. Hay aceleración
Explanation:
Para responder esta pregunta hay que tener en cuenta que existe aceleración cuando hay una variación en la velocidad:
"Una bicicleta baja por una pendiente y se accionan los frenos." Al activarse los frenos la velocidad de la bicicleta, disminuyendo. Hay aceleración."Un caballo galopa durante 2 min a 30 km/h." La velocidad del caballo de cambia, por lo que no hay aceleración."Una atleta corre desde la línea de salida y se detiene al llegar a la meta" La velocidad del atleta cambia al iniciar a correr, al igual que al detenerse. Hay aceleración.