All categories

4 years ago

How many grams of strontium (Sr, 87.62 g/mol) are in 2.92 moles of strontium?

Chemistry

2 answers:

S_A_V [24]4 years ago

8 0

Answer :The correct answer for mass of Sr is 255.85 g.

Mole :

It can defined as the amount of substance that contains as many entities as present 12 g of Carbon-12 .

In 1 mole of any atom , molecule or ions is equal to its atomic mass , molecular mass or ionic mass respectively .

Mass , molar mass ( or atomic mass or ionic mass ) and mole can be related as :

$Mole(mol) = \frac{ given mass (g)}{molar mass (\frac{g}{mol})}$

Given :

Molar mass of Strontium = 87.62 $\frac{g}{mol}$

Mole of Strontium = 2.92 mol

Plugging these values in Mole formula :

$2.92 mol = \frac{mass of Sr }{87.62 \frac{g}{mol}}$

Multiplying both side by 87.62 $\frac{g}{mol}$

$2.92 mol * 87.62 \frac{g}{mol}= \frac{mass of Sr }{87.62 \frac{g}{mol}} * 87.62 \frac{g}{mol}$

Mass of Sr = 255.85 g

kherson [118]4 years ago

3 0

Mass= number of mole *Molar mass
mass =2.92 mol*87.62 g/mol≈256 g

You might be interested in

Carbon tetrachloride can be produced by the following reaction: Suppose 1.20 mol of and 3.60 mol of were placed in a 1.00-L flas

hjlf

The given question is incomplete. The complete question is :

Carbon tetrachloride can be produced by the following reaction:

$CS_2(g)+3Cl_2(g)\rightleftharpoons S_2Cl_2(g)+CCl_4(g)$

Suppose 1.20 mol $CS_2(g)$ of and 3.60 mol of $Cl_2(g)$ were placed in a 1.00-L flask at an unknown temperature. After equilibrium has been achieved, the mixture contains 0.72 mol of $CCl_4$ . Calculate equilibrium constant at the unknown temperature.

Answer: The equilibrium constant at unknown temperature is 0.36

Explanation:

Moles of $CS_2$ = 1.20 mole

Moles of $Cl_2$ = 3.60 mole

Volume of solution = 1.00 L

Initial concentration of $CS_2$ = $\frac{moles}{volume}=\frac{1.20mol}{1L}=1.20M$

Initial concentration of $Cl_2$ = $\frac{moles}{volume}=\frac{3.60mol}{1L}=3.60M$

The given balanced equilibrium reaction is,

$CS_2(g)+3Cl_2(g)\rightleftharpoons S_2Cl_2(g)+CCl_4(g)$

Initial conc. 1.20 M 3.60 M 0 0

At eqm. conc. (1.20-x) M (3.60-3x) M (x) M (x) M

The expression for equilibrium constant for this reaction will be,

$K_c=\frac{[S_2Cl_2]\times [CCl_4]}{[Cl_2]^3[CS_2]}$

Now put all the given values in this expression, we get :

$K_c=\frac{(x)\times (x)}{(3.60-3x)^3\times (1.20-x)}$

Given :Equilibrium concentration of $CCl_4$ , x = $\frac{moles}{volume}=\frac{0.72mol}{1L}=0.72M$

$K_c=\frac{(0.72)\times (0.72)}{(3.60-3\times 0.72)^3\times (1.20-0.72)}$

$K_c=0.36$

Thus equilibrium constant at unknown temperature is 0.36

4 0

3 years ago

What is the chloride anion

BigorU [14]

Chloride Ion is a chlorine anion that forms the negatively charged part of certain salts

4 0

3 years ago

Read 2 more answers

How many water molecules are removed to assemble 10 fat molecules by joining glycerol and fatty acid molecules

algol13

20 molecules minus ten degrees equals 1001

4 0

3 years ago

How do scientists determine the number of neutrons in an isotope of an atom? O They find the number of protons. 0 They add the n

Elza [17]

Answer:

The three naturally-occurring isotopes of hydrogen. The fact that each isotope has one proton makes them all variants of hydrogen: the identity of the isotope is given by the number of protons and neutrons. From left to right, the isotopes are protium (1H) with zero neutrons, deuterium (2H) with one neutron, and tritium (3H) with two neutrons.

The term isotope is formed from the Greek roots isos (ἴσος "equal") and topos (τόπος "place"), meaning "the same place"; thus, the meaning behind the name is that different isotopes of a single element occupy the same position on the periodic table.[2] It was coined by a Scottish doctor and writer Margaret Todd in 1913 in a suggestion to chemist Frederick Soddy.

The number of protons within the atom's nucleus is called atomic number and is equal to the number of electrons in the neutral (non-ionized) atom. Each atomic number identifies a specific element, but not the isotope; an atom of a given element may have a wide range in its number of neutrons. The number of nucleons (both protons and neutrons) in the nucleus is the atom's mass number, and each isotope of a given element has a different mass number.

For example, carbon-12, carbon-13, and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13, and 14, respectively. The atomic number of carbon is 6, which means that every carbon atom has 6 protons, so that the neutron numbers of these isotopes are 6, 7, and 8 respectively.

4 0

3 years ago

Name something made of aluminum

ira [324]

A can is something made of aluminum

3 0

4 years ago

Read 2 more answers