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3 years ago

Which of Dalton's postulates required revision?

Chemistry

1 answer:

Gre4nikov [31]3 years ago

6 0

Answer:

Dalton's 5 postulates

All matter consists of indivisible particles called atoms.

Atoms of the same element are similar in shape and mass, but differ from the atoms of other elements.

Atoms cannot be created or destroyed.

Atoms of different elements may combine with each other in a fixed, simple, whole number ratios to form compound atoms.

Explanation:

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A sample of hydrogen peroxide (H202) has 2.0 grams of hydrogen (H) and 32 grams of oxygen (O). What is the percent composition o

Leto [7]

Answer:

O = 94.117%

H = 5.882%

Explanation:

Hydrogen peroxide (H202) Molar Mass = 34g

OH 1- 17g/mol

H 1+ = 1g/mol

O = 16g/mol

2 Grams H

32 grams O

Percentage composition of Hydrogen peroxide

O = 32/34 = 94.117%

H = 2/34 = 5.882%

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4 years ago

Convert 35 joules into calories. OR 1.410 cal OC 82,500 cal OD. 1.420,000 cal

lesya692 [45]

Answer:

0.83Cal

Explanation:

Given parameters:

Amount of energy given;

35J;

Convert to Cal;

1 calorie = 42 joules

x calories = 35 joules

Cross multiply;

42x = 35

x = $\frac{35}{42}$ = 0.83Cal

7 0

3 years ago

What is a polar liquid?

BabaBlast [244]

Polar liquids have both negative and positive ends.

3 0

4 years ago

Read 2 more answers

A chemist uses 4.0 L of sulfuric acid solution to produce 3.2 gram of product. How much of the same sulfuric acid solution is ne

____ [38]

The concept that can be used in order to determine the answer to this item is that of ratio and proportion. The ratio of the mass of the product to the sulfuric acid solution used in the first set should be proportional to that of the second. If we let x be the volume of the acid then, the equation that can be used is,

3.2 g / 4 L = 8 g / x L

The value of x from the equation is 10.

ANSWER: 10 L

7 0

3 years ago

For the formation of ammonia, NH3, the enthalpy of reaction is shown:

Nataly [62]

Answer: The amount of energy required to convert ammonia back to hydrogen and nitrogen is 45.9 kJ

Explanation:

Endothermic reactions are defined as the reactions in which energy is absorbed in the reaction. The enthalpy change of the reaction is positive.

Exothermic reactions are defined as the reactions in which energy is released in the reaction. The enthalpy change of the reaction is negative.

For the given chemical equation:

$3H_2(g)+N_2(g)\rightarrow 2NH_3(g);\Delta H=-45.9kJ$

In the above reaction, the enthalpy change is negative. So, the reaction is exothermic in nature.

For the reverse reaction, the magnitude of the enthalpy change remains the same but sign for it changes.

Hence, the amount of energy required to convert ammonia back to hydrogen and nitrogen is 45.9 kJ

4 0

3 years ago