2 years ago

What causes pressure inside a helium balloon?

1 answer:

7 0

Explanation:

So the gas pressure of a helium balloon arises from the impact of the collisions of the helium atoms between themselves and with the inside surface of the balloon. Of course, the outside atmosphere similarly exerts a pressure on the outside of the balloon.

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If the concentration of a KCl solution is 16.0% (m/v), then the mass of KCl in 26.0 mL of solution is ________.

melomori [17]

Answer:

The correct answer is 4.16 grams.

Explanation:

Based on the given information, the concentration of KCl solution is 16 % m/v, which means that 100 ml of the solution will contain 16 grams of KCl.

The molarity of the solution can be determined by using the formula,

M = weight/molecular mass × 1000/Volume

The molecular mass of KCl is 74.6 grams per mole.

M = 16/74.6 × 1000/100

M = 16/74.6

M = 2.14 M

Now the weight of KCl present in the solution of 26 ml will be,

2.14 = Wt./74.6 × 1000 /26

Wt. = 4.16 grams

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2 years ago

Fossil fuels are made up of organisms that died millions of years ago. Which best describes this source of energy

Alenkinab [10]

Nonrenewable
hope this helps

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Attempt 3 An irregular lump of an unknown metal has a measured density of 5.50 g/mL. The metal is heated to a temperature of 153

shepuryov [24]

Answer:

i think it's 20.0mL

Explanation:

i learned this question in class

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2 years ago

Match the vocabulary with the definitions.

Fiesta28 [93]

1: Decomposition reaction
2: Combination reaction
3: product
4: Reactant

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2 years ago

____________ was the first chemist to organize elements by atomic number

Natalija [7]

Answer:

Henry Moseley

Explanation: Passed with 98

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