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2 years ago

SIGNIFICANT FIGURES ARE FIGURES WITH

Chemistry

1 answer:

nexus9112 [7]2 years ago

5 0

Answer:

All zeros between other significant digits are significant. The number of significant figures is determined by starting with the leftmost non-zero digit. The leftmost non-zero digit is sometimes called the most significant digit or the most significant figure. For example, in the number 0.004205, the '4' is the most significant figure.

Explanation:

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2 years ago

If a sample contains 21.2g N how many moles of N does it contain

tigry1 [53]

Hey there!

The molar mass of nitrogen is 14.007.

Convert grams to moles:

21.2 ÷ 14.007 = 1.51

The sample containing 21.2g of nitrogen contains 1.51 moles of nitrogen.

Hope this helps!

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2 years ago

What's wrong with this thermochemical equation?

mafiozo [28]

This thermochemical equation needs to be balanced. Hence, option B is correct.

<h3>What is a balanced chemical equation?</h3>

A balanced equation contains the same number of each type of atom on both the left and right sides of the reaction arrow.

The balanced thermochemical equation is:

$H_2(g) + 2NaCl (s) + 3O_2 (g)$ → $2HCl (l) + 2Na (s) + 2O_3 (g)$

Hence, option B is correct.

Learn more about the balanced chemical equation here:

brainly.com/question/8062886

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1 year ago

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2 years ago

Boiling refers to which phase change?

Monica [59]

Boiling or also called evaporation is the conversion of liquid to gas through the application of heat. This phase change is an endothermic change and is the opposite of condensation from gas to liquid.

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2 years ago