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1 year ago

5

A star is mainly made of hydrogen gas, but most classes of stars include other elements such as helium, calcium, and other heavi

er elements and molecules.
Group of answer choices

True

False

2 answers:

Xelga [282]1 year ago

6 0

That would be true, since most other stats include helium, calcium, etc

Sidana [21]1 year ago

4 0

The answer is true! :)

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2 years ago

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fredd [130]

Answer:

The correct option is: c. petroleum jelly, d. Polyethylene glycol 4000/600 mixture

Explanation:

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2 years ago

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2 years ago

Select all the correct answers.

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2 years ago

Consider the following balanced reaction. How many grams of water are required to form 75.9 g of HNO3? Assume that there is exce

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Answer:

The answer is "10.84 g".

Explanation:

The formula for calculating the number for moles:

$\text{Number of moles }= \frac{\ Mass}{ \ molar \ mass }$

In the given acid nitric:

Owing to the nitric acid mass = $75.9 g$

Nitric acid molar weight $= 63\ \frac{g}{mol}$

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$\text{moles in nitric acid} = \frac{75.9}{63}$

$=1.204 \ mol$

In the given chemical equation:

$3 NO_2 \ (g) + H_2O \ (l) \longroghtarrow 2 HNO_3 \ (aq) + NO\ (g)$

In this reaction, 2 mols of nitric acid are produced by 1 mole of water.

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$=0.602\ \ \text{mol of water}.$

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Water moles $= 0.602\ mol$

Water weight molar $= 18.02 \ \frac{g}{mol}$

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$=10.84 \ g$

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2 years ago