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3 years ago

Calculate the molar mass

Chemistry

2 answers:

blsea [12.9K]3 years ago

6 0

Chlorine has a mass number of 35.5 (you know this from looking at the periodic table).

As you are looking at Cl2 you have two chlorine atoms meaning to calculate the molar mass you do 35.5+35.5= 71 mol

givi [52]3 years ago

4 0

1. Go to periodic table and find<span> the atomic </span>mass<span> (top little number) of each element.
2. Multiply each atomic </span>mass<span> by the number of atoms in the </span>formula<span>.
3. Add up the results together. </span>

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Which of the following techniques can be used to separate a heterogeneous mixture into its component parts?

fredd [130]

Answer:

Separation by density

Explanation:

Mixtures are made up of two or more pure substances which tends to keep their individual identities. These components can be separated from each other by different physical techniques.

Mixtures are further classified as;

(i) Homogenous Mixture:

In this type of the mixtures the components are uniformly mixed and their properties as well as composition as uniform throughout. Such mixtures are also called as solutions.

The physical methods used to separate these components from each other are distillation (taking heat and pressure into account), Solvent extraction, Magnetic separation, Chromatography e.t.c.

(ii) Homogenous Mixture:

In this type of the mixtures the components are not uniformly mixed and their physical properties and composition are also not uniform.

The physical methods used to separate these components from each other are Filtration, Magnetic Separation, Centrifugation, Flotation e.t.c.

So, in given options the density can play role by settling the massive components of heterogenous mixture to sit at the bottom and separated

8 0

3 years ago

Read 2 more answers

Convert 7.1X1025 molecules of water to moles

scoundrel [369]

Answer:

Moles of water in 7.1×10²⁵ molecules are 118 mol.

Explanation:

Given data:

Number of molecules of water = 7.1×10²⁵ molecules

Moles of water in 7.1×10²⁵ molecules = ?

Solution;

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

1 mole = 6.022 × 10²³ molecules of water

7.1×10²⁵ molecules of water × 1 mol / 6.022 × 10²³ molecules of water

1.18×10² moles of water 0r 118 moles of water

5 0

3 years ago

What is extensibility?

Katena32 [7]

Answer:

Extensibility is a software engineering and systems design principle that provides for future growth.

Explanation:

hope ot helps good day

5 0

3 years ago

State the law of conservation of mass

Katen [24]

It’s basically that’s any system that’s closed to all transfers of matter and energy the mass of the system has to remain constant over time because they can’t change meaning you can’t add or remove from it

8 0

3 years ago

23 grams of sodium reacts with 293 cm 3 of water that is initially at 298 k. it produces an enthalpy change of 197 kj. what is t

m_a_m_a [10]

448 K is the final temperature of the water.

<h3>What is specific heat capacity?</h3>

The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases by 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).

Given,

the mass of Na is 23 g

The volume of water = 293 cm3

Mass of water = 293 g

Total solution mass = 23 g + 293 g = 316 g

Specific heat capacity of water = 4.18 J/Kg

The equation relating mass, heat, specific heat capacity and temperature change is:

q = mcΔT

197 kJ = 316 g x 4.18 J/Kg x ( $T_{finals} - T_ {initial}$ )

197 kJ = 316 g x 4.18 J/Kg x ( $T_{finals}$ -298 K)

0.1491429956 x 1000 = $T_{finals}$ -298 K

149.1429956 + 298 = $T_{finals}$

447.1429956 = $T_{finals}$

448 K = $T_{finals}$

Hence, 448 K is the final temperature of the water.

<h3>What does a high specific heat capacity mean?</h3>

A high specific heat capacity means that it can store a large amount of thermal energy for a small change in mass or temperature.

Learn more about specific heat capacity here:

brainly.com/question/2530523

#SPJ4

5 0

2 years ago