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kirill [66]
4 years ago
13

Does anyone know how to do these?

Chemistry
1 answer:
tia_tia [17]4 years ago
6 0

Number 17 means oxygen.

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What is the density of 2 mol of (He) at STP? (Show work and explain, please!!!)​
Svetradugi [14.3K]

Answer:

d = 1.8 × 10⁻⁴ kg/L

Explanation:

Given data:

Moles of helium = 2 mol

Temperature and pressure = standard

Density = ?

Solution:

PV = nRT

V = nRT/ P

V = 2 mol × 0.0821 atm. L/ mol. K × 273 K / 1 atm

V = 44.8 L

Mass of helium:

Mass = number of moles  × molar mass

Mass = 2 mol × 4 g/mol

Mass = 8 g

Mass = 0.008 kg

Density;

Density = mass/ volume

d = 0.008 kg/ 44.8 L

d = 1.8 × 10⁻⁴ kg/L

7 0
3 years ago
Use atomic properties to explain the reduction of a less active metal by a more active one:(b) in the molten state. Give a speci
Bad White [126]

The reduction of a less active metal by a more active one is called metal displacement reactions. For example:

Fe + CuSO4 → FeSO4 + Cu

<h3>What is metal displacement reaction? </h3>

Displacement reactions is a reaction which includes a metal and the compound of a other metal. A more reactive metal will push or displace out a less reactive metal from its compound in this displacement reaction. The metal which is less reactive left uncombined after the reaction.

As we know that, electrons are the basis of the chemical reactions. If chemical compound or element A is more easily oxidized than B, then according to the terms of the activity series, the elements which are more easily oxidized can react with more chemicals, since they are able to act as a reducing agents for more chemicals.

Since, Metal ions are positively charged ions as they lose electrons. Some metals give up their electrons more readily than others and become more reactive.

Thus, we concluded that the reduction of a less active metal by a more active one is called metal displacement reactions. For example:

Fe + CuSO4 → FeSO4 + Cu

learn more about metal displacement reaction:

brainly.com/question/11777638

#SPJ4

6 0
2 years ago
Which of the following is the correct Lewis structure for carbon?
Vanyuwa [196]
It should be a capital C with 4 dots, one on each side.
5 0
3 years ago
The weight of an object is the product of its mass, m, and the acceleration of gravity, g (where g=9.8 m/s2). If an object’s mas
Thepotemich [5.8K]
Its weight is = m×g= 10×9.8
= 98 kg.m/s^2
5 0
3 years ago
What other elements does iron commonly bonds with.
Neko [114]

☁️ Answer ☁️

annyeonghaseyo!

Your answer is:

it can bond with oxygen to form rust or iron oxide. and it can bond with carbon to form steel.

Here's another one: Iron bonds with lots of things: Oxygen (Ferric Oxide = rust),Chlorine (Ferric Chloride]), Fluorine, ... , even other Iron (in aMetallic Bond or crystal).

Hope it helps.

Have a nice day hyung/noona!~  ̄▽ ̄❤️

5 0
3 years ago
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