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stellarik [79]
3 years ago
11

Which statement best describes why a machine is useful?

Biology
2 answers:
butalik [34]3 years ago
8 0

Answer

A machine can decrease both the input force and the input distance needed to do a given amount of work.

Explanation:

It's a matter of elimination. The first one is not a bad choice, let's keep looking thoug. The second choice, if it does a little amount of work, than how is it being called useful? Eliminate. Third choice this is the correct answer becasue if you compare it with last and first choice it is the better out of the  two.

antiseptic1488 [7]3 years ago
7 0

Answer:

A machine can decrease either the input force or the input distance needed to do a given amount of work.

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How many grams are NaCl are required to prepare 200 mL of a 3.10 M solution?
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The mass (in grams) of NaCl required to prepare the solution is 36.27 g

<h3>What is molarity?</h3>

Molarity is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:

Molarity = mole / Volume

<h3>How to determine the mole of NaCl</h3>
  • Volume = 200 mL = 200 / 1000 = 0.2 L
  • Molarity = 3.1 M
  • Mole of NaCl =?

The mole of NaCl in the solution can be obtained as follow:

Molarity = mole / Volume

Cross multiply

Mole = Molarity x Volume

Mole of NaCl = 3.1 × 0.2

Mole of NaCl = 0.62 mole

<h3>How to determine the mass of NaCl </h3>

We can obtain the mass of NaCl needed to prepare the solution as follow:

  • Molar mass of NaCl = 58.5 g/mol
  • Mole of NaCl = 0.62 mole
  • Mass of NaCl = ?

Mole = mass / molar mass

Cross multiply

Mass = mole × molar mass

Mass of NaCl = 0.62 × 58.5

Mass of NaCl = 36.27 g

Learn more about molarity:

brainly.com/question/15370276

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