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Dmitrij [34]
3 years ago
5

I need help i dont get it first question

Chemistry
1 answer:
Elena L [17]3 years ago
4 0

Answer:

Refinement

Explanation:

The 3R's policy was fundamentally introduced to safeguard the animals from harsh experiments which could change their mental and physical abilities and lead to their extinction one day.

The principles of 3R's (Replacement , Reduction and Refinement) were developed long time ago. It is an strategy to perform more Humane animal research.

These are defined as,

Replacement is a method to avoid or replace the uses of animals.

Reduction is a method to minimize the number of animals used every experiment.

Refinement is a method of minimizing animal suffering and improving welfare.

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There are  20.5 x 10^24 molecules are present in 3.4 moles of NH4NO3.

<h3>How many molecules in 3.4 moles of NH4NO3?</h3>

We know that one mole of a substance has  6.022 × 10²³ molecules so in 3.4 moles of NH4NO3, we have 20.5 x 10^24 molecules if we multiply the  6.022 × 10²³ with 3.4.

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Learn more about mole here: brainly.com/question/15356425

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