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3 years ago

Is salinity higher or lower near ice? EXPLAIN!

1 answer:

5 0

When salt is ejected in the ocean as sea forms, the waters salinity increases because salt water is heavier so it’s lower

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In this equation, which are the reactant(s) Mg(s)+o(g) =Mgo(s)

Mekhanik [1.2K]

Hello,

In the left side, Mg and O are reactants... and MgO is the product....

Hope it helped you... pls mark brainliest

6 0

3 years ago

How many grams of magnesium contain 4.80 x 10^25 atoms of magnesium

Aloiza [94]

Answer:

mass Mg = 1.937 Kg

Explanation:

from periodic table for Mg:

⇒ molecular mass Mg = 24.305 g/mol

∴ mol ≡ 6.022 E23 atoms

⇒ mol Mg = (4.80 E25 atoms)×(mol/6.022 E23 atoms)

⇒ mol Mg = 79.708 mol

⇒ mass Mg = (79.708 mol)×(24.305 g/mol)

⇒ mass Mg = 1937.3 g

⇒ mass Mg = 1.937 Kg

6 0

3 years ago

What is the mass of 2.16 moles of sulfur dioxide (SO2)?

Luda [366]

<h3>Answer:</h3>

138 g SO₂

<h3>General Formulas and Concepts:</h3>

Math

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Chemistry

Atomic Structure

Reading a Periodic Table

Stoichiometry

Using Dimensional Analysis

<h3>Explanation:</h3>

Step 1: Define

[Given] 2.16 moles SO₂

[Solve] grams (mass) SO₂

Step 2: Identify Conversions

[PT] Molar Mass of S - 32.07 g/mol

[PT] Molar Mass of O - 16.00 g/mol

Molar Mass of SO₂ - 32.07 + 2(16.00) = 64.07 g/mol

Step 3: Convert

[DA] Set up: $\displaystyle 2.16 \ mol \ SO_2(\frac{64.07 \ g \ SO_2}{1 \ mol \ SO_2})$
[DA] Multiply/Divide [Cancel out units]: $\displaystyle 138.391 \ g \ SO_2$

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

138.391 g SO₂ ≈ 138 g SO₂

6 0

3 years ago

What is the approximate volume of 280 g of chlorine gas (Cl2) at STP

Anettt [7]

<h3>Answer:</h3>

78 L Cl₂

<h3>General Formulas and Concepts:</h3>

Math

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Chemistry

Atomic Structure

Reading a Periodic Table
STP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 K

Stoichiometry

Using Dimensional Analysis

<h3>Explanation:</h3>

Step 1: Define

280 g Cl₂

Step 2: Identify Conversions

[PT] Molar Mass of Cl - 35.45 g/mol

Molar Mass of Cl₂ - 2(35.45) = 70.90 g/mol

[STP] 1 mol = 22.4 L

Step 3: Convert

[DA] Set up: $\displaystyle 280 \ g \ Cl_2(\frac{1 \ mol \ Cl_2}{79.90 \ g \ Cl_2})(\frac{22.4 \ L \ Cl_2}{1 \ mol \ Cl_2})$
[DA] Multiply/Divide [Cancel out units]: $\displaystyle 78.4981 \ L \ Cl_2$

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

78.4981 L Cl₂ ≈ 78 L Cl₂

5 0

3 years ago

Consider the reaction below. 2K+Br2------>2K+ +2Br-

sergeinik [125]

Answer: only Br2.

Justification.

In a chemical reaction the element that gains electrons experiments a reduction in its oxidation state, that is why it is said that it is reduced.

So, to know what element is being reduced you need to calculate the oxidation states of the elements involved.

Here I indicate the oxidation states of each element if the reaction putting them inside parenthesis:

Reactants side          Products side

K (0) K (1+)

Br (0)                          Br(1-)

So, K lost one electron, increasing its oxidation statefrom 0 to 1+, meaning that it is being oxidized.

And, each atom of Br gained one electron, reducing its oxidation state from 0 to 1-, meaning it is being reduced.

Therefore, the answer is that Br2 is the substance being reduced.

3 0

3 years ago

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