Answer:
[tex]\%P/P_{hierro}=41.1\%\\\\\%P/P_{arena}=24.4\%\\\\\%P/P_{cobre}=30.8\%\\\\\%P/P_{aluminio}=0.6\%[/tex]
Explanation:
¡Hola!
En este caso, dado que estamos tratando con problem sobre porcentaje peso/peso de hierro, arena, cobre y aluminio, primero debemos calcular la masa inicial de estos dos primeros en la mezcla original de acuerdo con:
[tex]m_{hierro}=300g*0.60=180g\\\\m_{arena}=300*0.40=120g[/tex]
Ahora si podemos calcular la masa de la mezcla final como la suma de las masas de todos los constituyentes de la mezcla:
[tex]m_T=180g+120g+135g+2.77g=437.77g[/tex]
Finalmente, podemos calcular los porcentajes P/P como se muestra a continuación:
[tex]\%P/P_{hierro}=\frac{180g}{437.77g} *100\%=41.1\%\\\\\%P/P_{arena}=\frac{120g}{437.77g} *100\%=24.4\%\\\\\%P/P_{cobre}=\frac{135g}{437.77g} *100\%=30.8\%\\\\\%P/P_{aluminio}=\frac{g}{437.77g} *100\%=0.6\%[/tex]
¡Saludos!
A student combines 20.0 grams of hydrogen and 20.0 grams of oxygen in a reaction. According to the law of conservation of mass, how many grams of water should be produced?
A)20.0grams B)40.0grams C)30.0grams D)10.0grams
Answer:
A)20.0grams
Explanation:
Answer:
10
Explanation:
If you start with 50 grams of H2O how much NaOH would you produce
2 Na + 2 H2O = 2 NaOH + H2
What are the 2 common uses for Polonium?
what is the physical change of a liquid to a solid by the removal of heat?
Consider the following balanced equation:
3 H2 + N2 --> 2 NH3
What volume of hydrogen gas will react in a perfect ratio
with 3 liters of nitrogen gas?
Answer:
[tex]from \: avogadros \: hypothesis \\ 1 \: mole \: of \: nitrogen \: reacts \: with \: 3 \: moles \: of \: hydrogen \\ 3 \: litres \: of \: nitrogen \: react \: with \: ( \frac{3 \times 3}{1} ) \\ 9 \: litres \: of \: hydrogen[/tex]
The temperature of 170 g of a material decreases by 20.0⁰C when it loses 3050 J of heat. What is its specific heat
Answer:
0.897 J/g.⁰C
Explanation:
Given the following data:
m = 170 g (mass)
ΔT = 20.0⁰C (change in temperature)
q = 3050 J (amount of heat)
The amount of heat (q) is calculated as follows:
q = m x Cp x ΔT
Thus, we introduce the data in the mathematical expression to calculate the specific heat (Cp):
Cp = q/(m x ΔT) = 3050 J/(170 g x 20.0⁰C) = 0.897 J/g.⁰C
Please answer all of the examples below!
Answer:
The first one is balanced. The second one is not.
Explanation:
The first one is balanced because there are the same amount of elements on the reactant side as there are on the product side. The second one is not balanced because there are not the same amount of elements on the reactant side as there are on the product side. Therefore, it is not balanced
More Detailed: first example
Reactant side (left of arrow)
H: 2
C: 1
O: 3
Product side (right of arrow)
H: 2
C: 1
O: 3
More detailed: second example
Reactant side:
Na: 1
O: 1
H: 1
C: 1
Product side:
Na: 2
O: 4
H: 2
C: 1
the variables needed to balance this equation is 2,1, 1, 1.
A beach ball has a volume of 2.5 L of gas while at a temperature of 500 K. If the volume decreases to 2 L, what is the new temperature?
Answer:
250k
I Really This Helps A Little Bit.
Which choices are uses of electrical energy?
Choose all that apply.
A. creates useful gases
B. supplies energy for heat
C. provides power to lights
D. creates a magnetic force
Answer:
option A,B and C.
are the options I chose.
The electrical devices include those that are needed to power appliances and those that are used in daily life. In order to make things operational, they need power or energy.
Electrical energy is taken from the movement of electronically charged particles. These when collide produce energy that can be used for heating, lighting, etc.Hence the option C is correct.
Learn more about the choices are uses of electrical energy.
brainly.com/question/20580527
What three temperature measurements Inust you make to calculate the specific heat of a sample using a calorimeter?
Answer:
Explanation:
Heat and temperature are two different but closely related concepts. Note that they have different units: temperature typically has units of degrees Celsius ( ∘ C ^\circ\text C ∘Cdegrees, start text, C, end text) or Kelvin ( Kstart text, K, end text), and heat has units of energy, Joules ( Jstart text, J, end text).
a raindrop has a mass of 0.050g. how many moles of water does a raindrop contain
Answer:
The raindrops of mass 0.050g has 0.0028 moles of water
A generator can produce both _______________________ (DC), which flows in one direction,and AC current;large power plants produce ___________________.
Answer:
1. direct current. 2. electrical power
Explanation
i believe number 2 is right
Ca(NO3)2 wht is the mass
Answer:
164.088 g/mol
Explanation: hope this helps
Answer:
Calcium nitrate
Explanation:
164.088 g/mol
give me the brainliest plss
Como se explica o fato de o diamante e o grafite serem formados pelo mesmo elemento, o carbono, e serem materiais completamente diferentes?
Answer:
Ver explicacion
Explanation:
La capacidad de un elemento de existir en diferentes formas en el mismo estado físico se conoce como alotropía.
No es solo el carbono el que exhibe alotropía. También se sabe que el azufre y el fósforo exhiben alotropía.
Hay dos alótropos cristalinos de azufre; grafito y diamante. El grafito y el diamante difieren en la disposición de los átomos de carbono y la naturaleza de los enlaces entre los átomos de carbono en ambas sustancias.
Por lo tanto, el grafito y el diamante tienen propiedades físicas y químicas observadas completamente diferentes debido a las diferencias en la disposición de los átomos de carbono en cada sustancia, así como a las diferencias en la naturaleza de los enlaces entre los átomos de carbono en ambas sustancias.
water will boil when...
Answer:
C
Explanation:
How many grams are in 1.52 moles of PC13? (molar mass: 137.33 g/mol)
What is the volume of a canister filled with gas if its pressure is changed to 9.8 atm from 2.5 atm at a volume of 9.1 L?
Answer:
2.3 L
Explanation:
A change in pressure-volume at constant temperature is described by the Boyle's law. The mathematical relationship between initial pressure and volume (P₁ and V₁) and final pressure and volume (P₂ and V₂) is given by:
P₁V₁ = P₂V₂
We have the following data:
initial pressure: P₁= 2.5 atm
initial volume: V₁ = 9.1 L
final pressure: P₂= 9.8 atm
Thus, we introduce the data in the mathematical expression and calculate the final volume V₂, as follows:
V₂ = P₁V₁/P₂ = (2.5 atm x 9.1 L)/9.8 atm = 2.3 L
Therefore, the volume of the canister is 2.3 L.
How much water should be added to 5.00 g of KCl to prepare a 0.500 m
solution? *
Molality = moles of solute
Kg of solvent
100 g
38g
500 g
134 g
Other
Answer:133.4
c
m
3
Explanation: Explanation:
Molarity is number of moles of solute divided by number of litres of solution.
M
=
n
V
Rearrange for V to give
V
=
n
M
Number of moles of KCl is the mass divided by the molar mass of KCl which is 75.5 g/mol, so (5/75.5) = 0.0667 moles.
Now plug in the numbers:
V
=
n
m
=
0.0667
0.5
=
0.1334
litres
So you need to add 0.1334 litres of 133.4
c
m
3
of water.
(NB: symbol for molarity is upper case M. m is metres).
Is oil a reasonable energy source? Why or why not?
Answer:
No, it is not.
Explanation:
Oil is a non-renewable source of energy. ... Burning oil can pollute the air. Much of our oil has to be imported and it is becoming more and more expensive as reserves reduce and imports increase. Producing electricity from crude oil is expensive compared to other fossil fuels such as coal or gas.
*You Can put this in your own words
What are the products of the following neutralization reaction? (No need to balance)
H3PO4 + Ba(OH)2 --> ??? + ???
A.)H2O + Ba3(PO4)2
B.)H30+ + BaPO4
C.)H30+ + Ba3(PO4)2
D.)H2O + BaPO4
H3PO4 + Ba(OH)2 --> Ba3(PO4)2 + H2O
so, (A) H2O + Ba3(PO4)2 is your answer.
which is the correct answer
Answer:
3
Explanation:
Answer:
3. 0.50 mol
Explanation:
GUYS PLEASE HELP ME
giving brainliest
2
Hope this helps :)
...............................
Does anyone have any idea what this means lol
Answer:
29.42 Litres
Explanation:
The general/ideal gas equation is used to solve this question as follows:
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K
According to the information provided in this question;
mass of nitrogen gas (N2) = 25g
Pressure = 0.785 atm
Temperature = 315K
Volume = ?
To calculate the number of moles (n) of N2, we use:
mole = mass/molar mass
Molar mass of N2 = 14(2) = 28g/mol
mole = 25/28
mole = 0.893mol
Using PV = nRT
V = nRT/P
V = (0.893 × 0.0821 × 315) ÷ 0.785
V = 23.09 ÷ 0.785
V = 29.42 Litres
why would a farmer add calcium hydroxide to his soil
what may happen when two light waves traveling from oposite directoins meet?
Answer:
The meet
Explanation:
What must be known to find an object's average speed?
*direction and time
*distance and time
*displacement and direction
Answer:
distance and time
Explanation:
total distance/ total time
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O How many moles of oxygen gas (O2) are needed to create EXACTLY 6 moles of Carbon dioxide(CO2)?.
A gas occupies 12.3 L at a temperature of 40.0 K. What is the volume when the temperature is increased to 60.0 K?
Answer:
the volume is 18.45 L
Explanation:
The computation of the volume when the temperature is increased to 60.0 K is shown below:
Since the gas occupied 12.3 L at a temperature of 40.0 k
And, the volume when the new temperature is 60.0 k
So, the volume is
= 60.0 k × 12.3 L ÷ 40.0 k
= 18.45 L
hence, the volume is 18.45 L
If a response is towards a stimulus it's described as _______; if a response is away from the stimulus it's described as _____.
Answer: Positive tropism, negative tropism
Explanation:
Stimulus can be define as external and internal agent which generate a response in an organism. If the growth and action is towards the stimulus it is called as positive tropism. If the growth and action is away from the stimulus it is called as negative tropism. Example, the growth of the stem towards the sunlight is called positive tropism whereas the growth of the root away from the sunlight is called negative tropism. Here, sunlight is the stimulus.
R is the ideal gas constant. We know it is equal to 0.0821. What is the unit for R?
L•atm/mol K
L•atm/mol · °C
mL • atm/mol. K
L• kPa/mol - K
Answer:
A. L•atm/mol K
Explanation:
The ideal gas law equation is given as follows:
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant
T = temperature (K)
As rightly stated in this question, R is the ideal gas constant, which can be different depending on the unit of the other components.
At STP;
V = 22.4L
P = 1 atm
T = 273 K
n = 1 mole
Hence, using PV = nRT
R = PV/nT
R = 1 × 22.4/1 × 273
R = 22.4/273
R = 0.08205
Approximately, R = 0.0821
With the units of P as atm, V as L, n as mol and T as K; R will be 0.0821 L•atm/mol K
