Answer:
Moles O2 = pV/RT = 2.75 x 5.60 / 0.08206 x 250=0.751
mass = 32 g/mol x 0.751 mol= 24.0 g
Explanation:
Hope it help
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The mass of 5.60 Liter oxygen at 1.75 atm pressure and 250.0 K temperature is 24.0 gram.
What is ideal gas equation?
Ideal gas equation is a hypothesis which tells about the behavior of gas at standard condition and it is represented as:
PV = nRT, where
P = pressure = 1.75 atm
V = volume = 5.60 L
R = universal gas constant = 0.0821 L.atm /K.mol
T = temperature = 250 K
n is the moles of gas which will further define as:
n = W/M, where
W = required mass
M = molar mass
Now putting all the value in the above ideal gas equation and calculate for moles as:
n = (1.75)(5.60) / (0.0821)(250)
n = 0.751
Molar mass of oxygen is 32 g/mol and we calculate their required mass as:
W = 32 g/mol x 0.751 mol= 24.0 g
Hence, the required mass of oxygen is 24.0 g.
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Why did early people most likely choose to settle in Mesopotamia?
Answer:
People wanted to settle there because it had good living conditions. There was rich soil, and lots of water sources.
I hope this helps!
In an exothermic reaction, the average kinetic energy of the particles of matter ib the products _____
1. decreases
2.stays the same
3. increases
Answer:
decreases
Explanation:
I'm hope it's correct
When there is an exothermic reaction so here the average kinetic energy of the particles of matter ib the products is option 1. decrease.
What is an exothermic reaction?In terms of thermochemistry, an exothermic reaction means the reaction where the total standard enthalpy should change so ΔH⚬ is negative. Also it should be release heat.
So based on this, When there is an exothermic reaction so here the average kinetic energy of the particles of matter ib the products is option 1. decrease.
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Review the poster.
https://www.cdc.gov/handwashing/pdf/wash-your-hands-fact-sheet-508.pdf
What is the greatest advantage of using a poster to present the information in “Stop Germs! Wash Your Hands”?
A poster that features brief sentences conveys urgency and simplifies content.
The extensive detail in posters captures viewers and causes them to stop and read.
The colors and images of a poster often convey a stronger message than words.
A poster appeals to several senses at once, which makes it hard to ignore.
A. A poster that features brief sentences conveys urgency and simplifies content.
On a cold, winter day, Sheena rubs her hands together to warm them up. How could Sheena actions be used to explain the Law of Conservation of Energy?
Answer:
When she rubs her hands together, it causes heat or friction
Balance this equation:
CuO + HCl → CuCl + H2O
Answer: CuO + 2 HCl = CuCl2 + H2O
Explanation:
Help please!! I'll name you brainliest!!
the answers is cacih2
wjdgagqjdhdgahahdhvddvvsvshsd
What are the steps to naming an ionic compound with both a polyatomic ion and transition metal.
Answer:
Write the name of transition metal as shown on the Periodic Table. Write the name and charge for the non-metal. If you have a polyatomic ion, use the Common Ion Table to find and write the formula and charge.
Explanation:
I hope this help you! :D
Balance the chemical equation. Based on the equation, how many grams of bromine are produced by the complete reaction of 11 grams of potassium bromide?
Answer:
Explanation:
The balanced chemical equation is Cl2 + 2KBr → 2KCl + Br2. The amount of bromine is calculated as follows:
11.0 g KBr (1mol KBr/119.002g KBr * 1mol Br2/2mol KBr * 159.808g Br2/1mol Br2= 7.39 g Br2.)
What is the atomic mass of this atom?
Answer:
3
Explanation:
The atomic mass is equal to the number of protons in an atom (and electrons if the atom is neutral).
A2B8 + C2 - B2C + AC2
Answer:
You need to put more info! If you are trying to find the GCF its 1
BRAINLIEST & 5 STARS & A FREE THANK YOU
Why was Wegener’s theory of continental drift almost completely discarded?
A. It didn’t explain how continents fit together.
B. It didn’t explain how mountains formed.
C. It wasn’t supported by fossil evidence.
D. It didn’t have a mechanism for how drift occurred.
Which of the following is evidence that the continents were once part of a supercontinent called Pangaea?
A. Island Arcs
B. Deep ocean trenches
C. Glacier scrapings
D. Mid-ocean ridges
Answer:
1: The speculation that continents might have 'drifted' was first put forward by Abraham Ortelius in 1596. The concept was independently and more fully developed by Alfred Wegener in 1912, but his hypothesis was rejected by many for lack of any motive mechanism. 2: The most obvious evidence for continental drift is that the continents appear to fit together like pieces of a puzzle. But scientists were skeptical , and Wegener needed additional evidence to support his hypothesis. Glaciers covered large areas that are now parts of these continents.
Answer:
1. D
2. C
Explanation:
1. Although now accepted, the theory of continental drift was rejected for many years, with evidence in its favor considered insufficient. One problem was that a plausible driving force was missing. A second problem was that Wegener's estimate of the speed of continental motion, 250 cm/year, was implausibly high.
2.The most obvious evidence for continental drift is that the continents appear to fit together like pieces of a puzzle. But scientists were skeptical , and Wegener needed additional evidence to support his hypothesis. Glaciers covered large areas that are now parts of these continents.
Please help me its balancing the equation
Answer:
1, 2, 2, 1
Explanation:
Which of the following would happen if Earth's moon were half the size that it is now? O The oceans' tidal variations would be smaller because the Moon would exert less gravitational pull on Earth's oceans. O The oceans' tidal variations would be greater because the Moon would exert less gravitational pull on Earth's oceans. O The oceans' tidal variations would be greater because the Moon would exert more gravitational pull on Earth's oceans. The oceans' tidal variations would be smaller because the Moon would exert more gravitational pull on Earth's oceans. & Previous
Answer: A. The oceans‘ tidal would be smaller because the moon would exert less gravitational pull on earths oceans.
Explanation:
i got it right :)
3. WDYT? What are some properties of metals?
Newton's first law is demonstrated in what station?
Answer:
hope this helps!
Explanation:
This law states that a still object will stay still unless a force pushes or pulls it. A moving object will stay moving unless a force pushes or pulls it. Gravity and friction are forces that constantly push and pull the "stuff" on earth. So, when we roll a ball, it slowly comes to a stop.
A 7.3 kg Bowling Ball accelerates at a rate of 3.7 m/s2. What is the Force acting on the ball?
Can someone help me with this questions. What do these two photos have in common?
How many moles are equal to 8.9 x 10^24 formula units of CO2?
Answer:
15 moles of CO₂
Explanation:
Given data:
Number of formula units = 8.9 ×10²⁴ formula units
Number of moles of CO₂ = ?
Solution:
The given problem will solve by using Avogadro number.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ formula units
8.9 ×10²⁴ formula units × 1mol / 6.022 × 10²³ formula units
1.5 mol ×10¹ mol
15 moles
DESPERATE WILL GIVE BRAINLIST AND THANKS (PLEASE HURRY )
Look at the Punnett square below which shows the cross between two frogs. Green is the dominant skin color while brown is the recessive skin color. What are the phenotype probabilities?
Question 8 options:
50% green, 50% brown
25% green, 25% brown
100% green, 0% brown
75% green, 25% brown
how many atoms are in 2.85x10^3 g of gallium
Answer:
2850 grams I hope this help
protons are one of the heavier pieces of an atom. true or false?
Answer:
true
Explanation:
How many joules would it take to raise a 9.00 kg sample of cobalt 6°C?
A car left from its initial position at 6 pm. The car arrived at its final position at 11pm. How much time did it take the car to arrive ?
Answer:
5 hours.
Explanation:
Given that,
Initial time, [tex]T_i=6\ pm[/tex]
Final time, [tex]T_f=11\ pm[/tex]
We need to find how much time did it take the car to arrive.
Time = final time-initial time
= 11 pm - 6 pm
= 5
So, it takes 5 hours by car to arrive.
PLS HELPPPPPPPPPPPPP
Answer:
3. Structural features
What requirements exist for a molecule to be polar?
Answer:
for a molecule to be polar to conditions must be met one we must have at least one polar bond or one lone pair on the central atom to if there are more than one polar bond they must be arranged in a way that their dipoles do not cancel
Does the following compound contain a polyatomic ion? LiC2H3O2
Yes
No
Answer:
yes
Explanation:
the polyatomic ion is acetate, C2H3O2
18. How is the kinetic energy of molecules changing when the molecules move faster?
The kinetic energy ...
a
is not changing
b
depends on the molecules.
С
is decreasing.'
d
is increasing
Scroll for more
Answer:
d
Explanation:
the more movement the more energy
Which of the following are held together by nonpolar covalent bonds? PLEASE HELP
Answer:
The atoms of chlorine are held together by non-polar covalent bonds. Covalent bonds are formed between two or more atoms having zero or very small electronegativity difference. For homonuclear molecules where the two bonding atom are of the same kind, the electronegativity difference is zero.
C. Atoms of chlorine (CI)
A covalent bond is created when the electrons from the two involved atoms are shared equally.The pair of electrons involved in this kind of bonding is referred to as the shared pair or bonding pair. Here the atoms of chlorine have non-polar covalent bonds. The correct option is C.
What are non-polar covalent bonds?A non-polar covalent connection is created when atoms with an equal amount of electrons share one another. The electronegativity of the two atoms is equivalent. When two atoms with similar electron affinities join together, like in the case of diatomic elements, it happens.
Non-polar covalent compounds are those in which there is no variation in electronegativity. In these compounds, the electronegativity does not change, preventing the motion of the bond pair's electrons in the direction of the linked atoms.
As a result, a molecule is non-polar and non-conducting since there is no bond or dipole moment between its atoms and no buildup of charges on the atoms.
Thus the correct option is C.
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What element is added to copper to make bronze? Why is this important for making bells?
Answer:
The correct answer is - tin.
Explanation:
Tin is the element that is mixed with copper to make bronze as bronze has many unique properties such as crisp sound quality and hardness. The hardness of the bronze allows them to make a good quality sound is come by adding tin to copper restricts the free flow of electrons of the copper atoms.
The pure metals have molecules present in an orderly manner and allow the electrons to free flow. This is why bell makers use bronze as it does not allow electrons to move freely which makes it hard and makes a good sound.
If 1.2 g of ammonium bicarbonate is treated with .75 grams of sodium chloride, 63.0075 grams sodium bicarbonate will be produced. In this reaction NaCI is limiting reagent. True or false
Answer:
True
Explanation:
Limiting reagent is the reactant that determines the progress of the reaction. It determines how much of the product is formed.
The equation for this reaction is;
NaCl (aq) + NH4HCO3 (aq) → NaHCO3 (aq) + NH4Cl (aq)
From the reaction, 1 mol of NaCl reacts with 1 mol of NH4HCO3 to produce 1 mol of NaHCO3
Converting to masses using; Mass = Number of moles * Molar mass
58.44g of NaCl reacts with 79.056g of NH4HCO3
If we were to sue the whole 1.2 g of NH4HCO3 we would require xg of NaCl
58.44 = 79.056
x = 1.2
x = 0.887g
The fact that 1.2g of NH4HCO3 requires 0.887g of NaCl (which is less than the available 0.75g) means that NaCl is the limiting reagent.
