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3 years ago

How does an adaptation begin?

2 answers:

6 0

In evolutionary theory, adaptation is the biological mechanism by which organisms adjust to new environments or to changes in their current environment.

Alexandra [31]3 years ago

5 0

Answer:

adaptation is the biological mechanism by which organisms adjust to new environments or to changes in their current environment. .

Explanation:

brainlesttttttt is apprciated

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In the following chemical reaction between H_2 and Cl_2 to produce HCl, what is the sum of the mass of HCl produced plus the mas

Nonamiya [84]

Answer:

Left over mass of hydrogen = 0.06 g

Mass of HCl produced = 12.41 g

Explanation:

Given data:

Mass of H₂ = 0.40 g

Mass of Cl₂ = 12.35 g

Mass of left over reactant = ?

Mass of HCl produced = ?

Solution:

Chemical equation:

H₂ + Cl₂ → 2HCl

Number of moles of H₂:

Number of moles = mass / molar mass

Number of moles = 0.40 g/ 2 g/mol

Number of moles = 0.2 mol

Number of moles of Cl₂:

Number of moles = mass / molar mass

Number of moles = 12.35 g/ 71 g/mol

Number of moles = 0.17 mol

Now we will compare the moles of HCl with H₂ and Cl₂.

H₂ : HCl

1 : 2

0.2 : 2×0.2 = 0.4

Cl₂ : HCl

1 : 2

0.17 : 2 × 0.17 = 0.34

Chlorine is limiting reactant.

Mass of HCl produced:

Mass = number of moles × molar mass

Mass = 0.34 mol × 36.5 g/mol

Mass = 12.41 g

Leftover mass of hydrogen:

Cl₂ : H₂

1 : 1

0.17 : 0.17

Number of moles of H₂ react with Cl₂ are 0.17.

Moles remain unreacted = 0.2 - 0.17 = 0.03 mol

Mass left over:

Mass = number of moles × molar mass

Mass = 0.03 mol × 2 g/mol

Mass = 0.06 g

6 0

3 years ago

A roll shaped like a car

dimaraw [331]

Is this a chemistry pun? It's <span>carbon.</span>

3 0

3 years ago

In one process, 6.05 kg of caf2 is treated with an excess of h2so4 and yields 2.85 kg of hf. calculate the percent yield of hf.

Kobotan [32]

The % yield of Hf is 91. 8%

calculation

% yield = actual mass/ theoretical mass x100
actual mass = 2.85 Kg

calculate the theoretical mass
by first write the equation for reaction

CaF2 +H2SO4 → 2HF + CaSO4
find the moles of CaF2 used
moles = mass/molar mass
mass = 6.05Kg = 6.05 x1000 =6050 Kg
molar mass of CaF2 = 40 + (19 x2) = 78 g/mol

moles= 6050/ 78 = 77.6 moles

by use of mole ratio between CaF2 to HF which is 1:2 the moles of HF is therefore = 77.6 x2 =155.2 moles of Hf

find the theoretical mass of HF = moles x molar mass ( 1 +19=20g/mol)

= 155.2 moles x 20 g/mol = 3104 grams = 3104 /1000 = 3.104 Kg

The % yield is therefore = 2.85 Kg/ 3.104 Kg x100 = 91.8%

8 0

4 years ago

Can someone give me an anology on a cave please? And Mars lol. They dont have to be nothing special just a little sentence thank

g100num [7]

Answer:

Explanation:

Mars is the fourth planet from the sun. Mars is more than 142 million miles from the Sun. A day on Mars is 24.6 hours. A year on Mars is 687 Earth days.

4 0

3 years ago

The compound magnesium phosphate has the chemical formula Mg3(PO4)2. In this compound, phosphorous and oxygen act together as on

Lapatulllka [165]

Answer:

The 2 in the formula means that, there are 2 phosphate anions that forms the salt.

Explanation:

Magnesium phosphate is a ionic salt.

The formula indicates that 3 moles of Mg and 2 moles of anion phosphate are contained in 1 mol of compound.

3Mg²⁺ + 2PO₄⁻³ → Mg₃(PO₄)₂

The phosphate anion comes from phosphoric acid and it is generated when the acid loses the 3 protons.

H₃PO₄ → 3H⁺ + PO₄⁻³

Phosphate has a negative charge of -3, so when it bond to magnesium, which has a charge of +2, there must be 3 magnesium and 2 phosphate to make a global charge +6 -6 in the ions

6 0

4 years ago