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3 years ago

Subject. Earth Science.

Chemistry

2 answers:

Vilka [71]3 years ago

6 0

Answer:

Slow cooling of magma results in the formation of c. coarse-grained textured rocks. An example of a coarse grained textured rock formed in this fashion is granite. As the rate of cooling of igneous rocks increases, the size of the crystal that is formed decreases. The Bowen's reaction series shows the different rocks cooled at different rates.

Read more on Brainly.com - brainly.com/question/4959064#readmore

Explanation:

Anettt [7]3 years ago

3 0

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what is the total amount of energy required to remove the most loosely bound electron from each atom in a mole of gaseous Ca

Temka [501]

Answer:

589.8 kJ/mol

Explanation:

Let's consider the process in which the most loosely bound electron from each atom in a mole atom of gaseous calcium is removed.

Ca(g) + Energy ⇒ Ca¹⁺(g) + 1 e⁻

The energy involved in this process is known as First Ionization Energy. The First Ionization Energy for calcium is 589.8 kJ/mol.

5 0

3 years ago

How many atoms are there in 23g of Na? How would I attempt this question. Thanks

Pavlova-9 [17]

Avodagros number i.e. 6.023 ×10^23

4 0

3 years ago

Read 2 more answers

Water softeners often replace calcium ions in hard water with sodium ions. since sodium compounds are soluble, the presence of s

Mamont248 [21]

% mass Na = (g Na / g H2O) x 100
g Na = (% mass Na)(g H2O) / 100 = (5.2 x 10^-4 g Na / g H2O) 

2.4 g Na x (1 g H2O / 5.2 x 10^-4 g Na) = 4600 g Na 

4600 g Na x (1 mL H2O / 1 g H2O) = 4600 mL H2O = 4.6 L H2O which is a little more than a gallon

6 0

3 years ago

A solution is made by mixing equal masses of methanol, CH 4 O , CH4O, and ethanol, C 2 H 6 O . C2H6O. Determine the mole fractio

wariber [46]

Answer: The mole fraction of methanol

Xmeth= 0.59

The mole fraction of ethanol

Xeth = 0.41

Explanation:

Mole fraction of a component can be determined by:

Xi = moles of i / total moles of the components the components

Where i indicates the component

An equal mass of 100.0g is assumed for both methanol and ethanol

Molar mass of Methanol (CH4O)

= (1*12) + (4*1) +(1*16) =32g/mol

Mole of Methanol = mass of methanol /molar mass of methanol

=100/32 = 3.13mol.

Molar mass of ethanol ( C2H6O)

= (2*12)+(6*1)+(1*16) = 46.0g/mol

Mole of ethanol = 100/46

= 2.17mol.

Mole fraction of methanol (Xmeth)

= moles of methanol / total moles

Xmeth = 3.13/(3.13+2.17)

Xmeth = 0.59

Mole fraction of ethanol (Xeth)

= moles of ethanol /total moles

= 2.17/((3.13+2.17)

Xeth= 0.41

5 0

3 years ago

How many milliliters of a 25% (m/v) NaOH solution would contain 75 g of NaOH?

Luda [366]

Answer:

E 3.0 x 10² mL.

Explanation:

Hello there!

In this case, according to the formula for the calculation of the mass-volume percent:

$\% m/V=\frac{m_{solute}}{V_{solution}}*100\%$

Whereas it is necessary to know the mass of the solute and the volume of the solution. Thus, given the mass of NaOH as the solute, the volume of the solution would be:

$V_{solution}=\frac{m_{solute}}{\% m/V}*100\%$

Then, by plugging in we obtain:

$V_{solution}=\frac{75g}{25\%}*100\%\\\\V_{solution}=3.0x10^2mL$

Thus, the answer is E 3.0 x 10² mL.

Best regards!

5 0

3 years ago