How many moles of Cr are in 156 g of the element?a. 1.0 mol
b. 3.0 mol
c. 6.5 mol
d. 156 mol

Answers

Answer 1

Answer:

Mole measure the number of elementary entities of a given substance that are present in a given sample. 3 mole of Cr are in 156 g of the element. The correct option is option B.

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.

Mathematically, mole and molar mass of chromium can be related as :

number of mole =given mass of chromium÷ molar mass of chromium

Mass of chromium=156 g

Molar mass of 1 mole of chromium= 51.9961 g/mol

Substituting the given values we get,

number of mole =156 g ÷ 51.9961 g/mol

number of mole= 3

Therefore, the correct option is option B. 3 mole of Cr are in 156 g of the element.

To know more about mole, here:

brainly.com/question/15209553

#SPJ2

Answer 2

Answer:

You are given the number of grams of Chromium which is 156 grams. The molar mass of chromium is 52 grams per mole. Divide 156 grams to 52 grams per mole of Chromium and you will get 3 moles of Chromium. The answer is letter B.

Related Questions

Pic provided: Which part is the amine?
In the world of chemistry a mole is a number of something a very large number of something.Just as a dozen is 12 of something a mole is about 6.02*10^23 of something.In chemistry we like the number of atoms or molecules in moles.If one mole is equal to 6.02*10^23 atoms and you have 9.00 *10^23 atoms then how many moles do you have?
What is the difference between a mixture and compound?
Electronegativities of the elements Na, Al, P, and Cl follow a specific trend across the period. Based on this trend, an electron will be most strongly attracted toNa.Al.P.Cl.
Is cobalt chloride solution a conductor or an insulator

One mole of an ideal gas is held at standard conditions. At what Kelvin temperature would the pressure be doubled?

Answers

The pressure of the gas will become double when its Kelvin temperature becomes $\boxed{{\text{twice}}}$ its initial value.

Further Explanation:

Ideal gas equation:

Ideal gas is just a theoretical concept and practically no gas can act as ideal. It can be considered as group of random moving particles having perfectly elastic collisions between them.

Ideal gas equation for one mole of gas is mentioned below.

PV = RT …… (1)

Here,

P is the gas pressure.

V is the gas volume.

T is the absolute temperature of gas.

R is the universal gas constant.

Standard conditions refer to state when pressure of gas is 1 atm and its temperature is 273 K.

Consider P’ and T’ to be new pressure and temperature respectively while all other terms in ideal gas equation remains constant. Equation (1) then modifies as follows:

P’V = RT’ …… (2)

Since new pressure is doubled, P’ becomes 2P. Equation (2) becomes,

(2P)V = RT’ …… (3)

Dividing equation (3) by equation (1), we get:

$\frac{{\left( {{\text{2P}}} \right){\text{V}}}}{{{\text{PV}}}} = \frac{{{\text{RT'}}}}{{{\text{RT}}}}$ …… (4)

Solving for T’,

${\text{T'}} = {\text{2T}}$

Therefore pressure is doubled when temperature becomes twice its initial value.

Learn more:

Which statement is true for Boyle’s law? brainly.com/question/1158880
Calculation of volume of gas: brainly.com/question/3636135

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Ideal gas equation

Keywords: ideal gas equation, R, T, P, V, 2P, 2T, pressure, volume, universal gas constant, P’, T’, standard conditions.

The volume should be kept in constant condition.
Then we go $PV=nRT P/T = constant P1/T2 =P2/T1 T2=P1 T1 /P2$
and if P2 is equal to 2P1, we have $T2=P1T1/2P1=1/2 T1$
which means that needed temperature is half of the initial temperature

Which statement most accurately describes the behavior of a catalyst? (A) A catalyst increases the ∆G of a reaction and hence the forward rate.
(B) A catalyst reduces the ∆H of a reaction and hence the temperature needed to produce products.
(C) A catalyst reduces the activation energy for a reaction and increases the rate of a reaction.
(D) A catalyst increases the equilibrium constant and final product concentrations

Answers

the a answer to the statement is between B and D

Match the following chemical reactions:synthesis, reversible, exchange, decomposition

1. molecules rearrange and form new molecules
2. simultaneous decomposition and synthesis
3. bonds broken and elements released
4. molecules formed from components

Answers

Answer:

Synthesis - 4

reversible- 2

exchange- 1

decomposition-3

Explanation:

In synthesis reaction two or more components combines to form a single product. example 2H2+O2⇒2H2O

In reversible reaction two reactants combine to form two products . The products then reacts and forms back the reactants. example N2 +3H2 ⇒2NH3

In exchange reaction there is an alternation of ions of reactants to form new products. AB+CD ⇒AC + BD

In decomposition reaction, molecules of a compound break down by the action of heat or light or catalyst. example CaCO3 ⇒CaO +CO2

Final answer:

Synthesis involves creating new molecules from components, while Decomposition involves breaking molecules down into their separate elements. Exchange is when molecules rearrange and form new molecules, and Reversible reactions can go forward or backwards.

Explanation:

In chemistry, various types of chemical reactions have different characteristics. Here's how they match with the provided definitions:

Synthesis corresponds with 'molecules formed from components'(4) since synthesis is a type of chemical reaction where two or more simple substances combine to form a more complex substance.
Reversible doesn't correspond directly with any of these definitions, but it designates a reaction that can proceed in either direction - from reactants to products or from products back to reactants.
Exchange relates to 'molecules rearrange and form new molecules'(1) because an exchange reaction is one in which compounds exchange elements or groups in order to form different compounds.
Decomposition is 'bonds broken and elements released'(3). In a decomposition reaction, a compound is broken down into simpler substances.

Learn more about Chemical Reactions here:

brainly.com/question/34137415

#SPJ6

By which process does the Sun produce energy?A. photosynthesis
B. nuclear fission
C. nuclear fusion
D. combustion

Answers

it is C. nuclear fusion

A certain element has a melting point over 700 ∘C and a density less than 2.00 g/cm3. What is one possible identity for this element?

Answers

The only answer to an element that melts over 700 degrees Celcius and has a density of less than 2 g/cm3 is Beryllium. This element is rarely found anywhere in the entire universe. It's atomic number is 4 and it is created through stellar nucleosynthesis.

The element is Beryllium

Write a balanced equation for the dissolution of CaCO3? lable all phases too... So far I have CaCO3(aq)<-->Ca^2+(aq)+CO3^2-(aq) but that is wrong. Please help!!