Answer:
48 g/mol
Explanation:
Step 1: Calculate the mass of the gas (m)
According to the law of conservation of mass, the mass of the solid before the decomposition must be equal to the sum of the masses of the solid residue and the gas
mSolid = mResidue + mGas
mGas = mSolid - mResidue = 4.73 g - 4.10 g = 0.63 g
Step 2: Convert 320 cm³ to L
We will use the conversion factor 1 L = 1000 cm³.
320 cm³ × 1 L/1000 cm³ = 0.320 L
Step 3: Calculate the moles of gas (n)
The gas is at room temperature (298.15 K) and room pressure (1 atm). We can calculate the moles of gas using the ideal gas equation.
P × V = n × R × T
n = P × V/R × T
n = 1 atm × 0.320 L/(0.0821 atm.L/mol.K) × 298.15 K = 0.0131 mol
Step 4: Calculate the molecular mass of the gas (M)
We will use the following expression.
M = m/n = 0.63 g/0.0131 mol = 48 g/mol
1. What happened to the drop of iodine when it was dropped into the starch solution? Did
it float, sink, disperse, or change color? Give a brief reason for each observation.
Explanation:
it changes colour it gives blue black colour
9. Which of the following is needed as a reactant for cellular
respiration?
A. Carbon dioxide
B. Oxygen
C. Water
D. Chlorophyll
oxygen is needed as a reactant for cellular respiration
What is cellular respiration ?
Cellular respiration can be defined as the process which occurs in every cells mainly mitochondria of plants and animals, it involve in the break down of sugars in the presence of oxygen and releases energy in the form of ATP.
The waste product of this process are carbon dioxide and water during exhalation process done by lungs, breathing and cellular respiration are related to each other.
At every step of cellular respiration energy is used in the form of ATP and carry out the normal function. It can aerobic and anaerobic respiration on the basis of use of oxygen.
For more details regarding cellular respiration, visit
brainly.com/question/14251313
#SPJ6
The degree of order of matter is directly proportional to the cohesive forces that hold the matter together. In other words, the more organized the state of matter, the stronger the “glue” that holds it together. Given the above which one of the states has the strongest cohesive forces?
A. Liquid
B. Solid
C. All states must have the same cohesive forces
D. Gas
Answer:
B. Solid
Explanation:
As the problem states, the stronger the cohesive forces of a substance, the more ordered that substance is.
Asking which state has the strongest cohesive forces is the same as asking which state is the most organized.
Solids are more organized than liquids (as solids have a definite shape and volume). Liquids are more organized than gases (as liquids have a definite volume).
Do Newton's Laws still apply in space?
Answer:
Yes, they work in space. I forgot an example, will edit the post when I found it
Hope this helps!
explain the variation of basicity in group III A members down the group
Answer:
Explained below
Explanation:
Group 3A elements are made up of the metalloid - boron (B) and other metals such as Aluminum (Al), gallium (Ga), indium (In), & thallium (Tl).
Now, as we go down the group, the size of the central atom will increase thereby causing the lone pair to become delocalized over a larger volume space. Thus, it's not readily available for donation and thus basicity increases
Sound waves vibrate your eardrum, which moves bones in your middle
ear. The soundwaves then pass through a fluid in your inner ear, and on to
tiny hairs that send signals to the brain.
A. True
B. False
Answer: A. True
Explanation:
Which two actions can people take to protect themselves during a heat
wave?
O A. Eat extra food
O B. Get plenty of exercise
C. Drink lots of water
D. Stay in the shade
Answer:
Stay in shade
Explanation:
aaaaaadffgghujollknnbcczzdfuomnb xdf
Answer:
c answer and d is correct answers
Explanation:
i hope helpful to us
A sample of aluminum, which has a specific heat capacity of 0.897·J·g−1°C^−1 , is put into a calorimeter (see sketch at right) that contains 300.0g of water. The aluminum sample starts off at 94.5°C and the temperature of the water starts off at 21.0°C .When the temperature of the water stops changing it's 23.8°C .The pressure remains constant at 1atm .Calculate the mass of the aluminum sample.
Answer: The mass of aluminium sample is 55.4 gram
Explanation:
[tex]Q_{absorbed}=Q_{released}[/tex]
As we know that,
[tex]Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})[/tex]
[tex]m_1\times c\times (T_{final}-T_1)=-[m_2\times c\times (T_{final}-T_2)][/tex]
where,
[tex]m_1[/tex] = mass of aluminium = ?
[tex]m_2[/tex] = mass of water = 300.0 g
[tex]T_{final}[/tex] = final temperature = [tex]23.8^0C[/tex]
[tex]T_1[/tex] = temperature of aluminium = [tex]94.5^oC[/tex]
[tex]T_2[/tex] = temperature of water = [tex]21.0^oC[/tex]
[tex]c_1[/tex] = specific heat of aluminium = [tex]0.897J/g^0C[/tex]
[tex]c_2[/tex] = specific heat of water = [tex]4.184J/g^0C[/tex]
Now put all the given values in equation (1), we get
[tex]-[m_1\times c_1\times (T_{final}-T_1)]=[m_2\times c_2\times (T_{final}-T_2)][/tex]
[tex]-[m_1\times 0.897\times (23.8-94.5)^0C]=[300.0g\times 4.184\times (23.8-21.0)][/tex]
[tex]m_1=55.4g[/tex]
Therefore, the mass of aluminium sample is 55.4 gram
Based on appearances, which group of animals likely has the greatest genetic diversity?
bears
horses
whales
birds
need help pleas can some body helpe me?
Answer:
they are not liquids at room temperature, so your answer is the last one
Explanation:
STEP 7: LEAD
Initial temperature of metal = 100
✓°C
Initial temperature of water = 22.6
✓ °C
Final temperature of both = 23.3
°C
Subtract to find the temperature
changes for the water and the metal.
AT (water) = 0.7 ✓ °C
AT (metal) = 76.7 ✓ °C
Answer:
answer is 76
Explanation:
pls mark me brainliest right
Answer:
0.7
76.7
this is for (LEAD) the last one
Calculate the number of moles in 42.15g of magnesium carbonate.
Answer:
0.5mol
Explanation:
Please mark as brainliest
WHAT IS THE CHEMICAL FORMULA FOR Rb+ and P3-
Answer:
3Rb3P → 9Rb + P3
Hope it helps!!!
The balanced form of the expression is given as:
[tex]3Rb_3P \rightarrow 9Rb + P3[/tex]
Balancing chemical equationsFrom the given question, we are to balance the equation of Rb and P^3+
[tex]Rb_3P \rightarrow Rb + P3[/tex]
Since the number of moles at the reactant must be equal to that of the product.
The balanced form of the expression is given as:
[tex]3Rb_3P \rightarrow 9Rb + P3[/tex]
Learn more on balancing of equation here: https://brainly.com/question/26227625
What makes an acid acidic? a) Number of protons in a molecule b) Temperature c) Chemical structure d) Phase
Answer:
C.
Explanation:
Chemical structure
Field foresters are associated with which of the following types of forestry?
urban
national
international
private sector
Answer:
urban and private sector
Explanation:
6.
List two possible hazards that occur when clients/family members smoke near oxygen.
Describe two actions the PSW could take to avoid these hazards in the workplace and
ensure their safety as well as the client's. (4 Marks)
Hazard one
Hazard two
Actions
anyone here know about the law of assumption?
Answer:
uhhh not really i don't even know what that is LOL
Describe the critical property ofelectrons in 2s versus 2p orbitals that causes the radial distribution functions of these orbitals to have different shapes about the nucleus such that 2s electrons effectively penetrate closer to the nucleus than do electrons in 2p orbitals.Then, write an expression for the potential energy function describing this effect.
Answer:
Answer is explained in the explanation section below.
Explanation:
Penetration refers to the proximity of electrons in an orbital to the nucleus.
Deeper-penetrating electrons have less shielding and therefore a higher Effective nuclear charge (Zeff), but they better shield other electrons.
To illustrate penetration, we may use the idea of Zeff, or effective nuclear charge. It's actually the difference between the number of charged protons and the number of shielded electrons. To put it another way, how effective the nucleus is at attracting electrons. Since they do not shield themselves, the core electrons penetrate the most and are exposed to the most strong nuclear charge.
The electron probability density is highest in the orbital's centre or nucleus for 28-orbitals.
In a multi-electron unit, the electron density near the nucleus of an atom for each shell and subshell of an electron is used to measure the nucleus penetration by an electron.
Since it has a higher electron density near the nucleus, the 2s electron penetrates the nucleus of the atom more than the 2p electron.
A 2s electron is less well shielded by the core electrons than a 2p electron because it can spend more time near the nucleus as a result of the penetration.
Mathematical Expression:
v = [tex]\frac{-Zeff * e^{z} }{r^{2} }[/tex]
By the reaction between
H3PO4 and Ca(OH)2,
Can be formede:
a. Ca(HPo4)2,
b. СaHP4
c. Ca(H2PO4)2
d. Ca2HP02
e.Сa3(PO4)2
the correct answers : b, c, e
the question is:
I am preparing for an admittion test in chemistry, I face this kind of questions which I dont how to understand or if I should only memorize.
I appreciate all your help.
thank you alot.
Answer:
ANSWER is E
Explanation:
2H₃PO₄ + 3Ca(OH)₂→ 6H₂O + Ca₃(PO₄)₂
Answer:
First step is to find what the products would be. Since this seems to be a double displacement, you get: H3PO4(aq)+Ca(OH)2(aq)→ H2O(L)+Ca3(PO4)2(s)
You know the products because H has a charge of +1, so PO4 must have a charge of -3, and since OH has a charge of -1, Ca must be +2. Then make each compound have a net charge of 0. H20 is a liquid since aq solutions have liquid water. Ca3(PO4)2 is a solid, use the solubility rules.
Lastly, balance the equation: 2H3PO4(aq)+3Ca(OH)2(aq)→ 6H2O(L)+Ca3(PO4)2(s)
So the salt formed is Ca3(PO4)2
Please HELP! Which of the following is a reason why day turns into night on Earth?
Earth's axis is tilted
Earth revolves around the Sun
Earth rotates from west to east
Earth's gravity pulls on the moon
Answer:
Earth rotates from west to east
Explanation:
hope it helps
Give the hybridization for the C in HCN
Answer:
[tex]\huge\boxed{sp \ hybridization}[/tex]
Explanation:
In HCN,
Carbon is singly - bonded ( 1 sigma bond ) to Hydrogen while triply - bonded ( 1 sigma, 2 pi bonds) to Nitrogen.
Thus, the Stearic No. for Carbons is:
= No. of sigma bonds + No. of lone pairs
= 2 + 0
= 2
According to Stearic No.:
=> sp = 2
=> sp² = 3
=> sp³ = 4
Hence,
The hybridization of C in HCN is sp.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807Chlorine gas and solid phosphorus combine to produce phosphorus trichloride gas.
Write a balanced chemical equation for this reaction.
4. How many moles of Cl2, are obtained by the
decomposition of 6.3 moles of POCI3?
Answer:
6.3moles
Explanation:
The balanced chemical equation for the decomposition of phosphorus oxychloride (POCl3) is as follows:
POCl3 → POCl + Cl2
Based on the above decomposition reaction, it shows that;
1 mol of POCl3 will decompose to give 1 mole of Cl2
Hence, 6.3 moles of POCI3 will give 6.3 moles of Cl2.
Is this statement true or false?
One body system maintains the constant internal environment of the whole body.
Compare and contrast the three states of matter liquid, solid, and gas.
Answer:
For example: water is liquid, ice is solid, and water vapor is gas
Explanation:
Which substance can be decomposed by chemical change?
A.
beryllium
B.
boron
C.
methanol
D.
magnesium
Describe how to prepare 100.00 mL of a 0.250 M sodium chloride (NaCl) solution using sodium chloride powder.
Answer:
The answer to your question is given below.
Explanation:
We'll begin by converting 100 mL to L. This can be obtained as follow:
1000 mL = 1 L
Therefore,
100 mL = 100 mL × 1 L / 1000 mL
100 mL = 0.1 L
Next, we shall determine the number of mole of NaCl in the solution. This can be obtained as follow:
Volume of solution = 0.1 L
Molarity of NaCl = 0.250 M
Mole of NaCl =?
Molarity = mole / Volume
0.250 = mole of NaCl / 0.1
Cross multiply
Mole of NaCl = 0.250 × 0.1
Mole of NaCl = 0.025 mole
Finally, we shall determine the mass of 0.025 mole of NaCl. This can be obtained as follow:
Mole of NaCl = 0.025 mole
Molar mass of NaCl = 23 + 35.5
= 58.5 g/mol
Mass of NaCl =?
Mole = mass / Molar mass
0.025 = mass of NaCl /58.5
Cross multiply
Mass of NaCl = 0.025 × 58.5
Mass of NaCl = 1.46 g
Thus, to prepare the solution, weigh out 1.46 g of NaCl and dissolve in 1 L of water.
Most cooking utensils are made up of aluminum because aluminum is _____
Explanation:
Cooking utensils, such as pots, pans and menu trays, are often made from aluminium because it is lightweight and conducts heat well, making it energy-efficient for heating and cooling. These properties also make it a preferred material for packaging.
Hey! I was wondering how to get the solution to this question!
A solution was prepared by dissolving 0.541 g of benzoic acid (HC6H5COO) in 100 mL of
water. The pH was measured to be 2.78. What is the Ka for benzoic acid?
Answer:
6.22 × 10⁻⁵
Explanation:
Step 1: Write the dissociation reaction
HC₆H₅COO ⇄ C₆H₅COO⁻ + H⁺
Step 2: Calculate the concentration of H⁺
The pH of the solution is 2.78.
pH = -log [H⁺]
[H⁺] = antilog -pH = antilog -2.78 = 1.66 × 10⁻³ M
Step 3: Calculate the molar concentration of the benzoic acid
We will use the following expression.
Ca = mass HC₆H₅COO/molar mass HC₆H₅COO × liters of solution
Ca = 0.541 g/(122.12 g/mol) × 0.100 L = 0.0443 M
Step 4: Calculate the acid dissociation constant (Ka) for benzoic acid
We will use the following expression.
Ka = [H⁺]²/Ca
Ka = (1.66 × 10⁻³)²/0.0443 = 6.22 × 10⁻⁵
Which form of energy increases in an object as you raise it higher off the ground?
A. Electrical
B. Kinetic
C. Mechanical
D. Potential
Answer:
D. Potential
Explanation:
Answer:
Potential
Explanation:
Gravitational potential is the energy the object has of it's position of the earth's surface. When the object is lifted, work is done. When work is done in raising the height of an object, energy is transferred as a gain in the gravitational potential energy of the object.
