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GarryVolchara [31]
3 years ago
7

Molecules tend to move from an area where they are more concentrated to an area where they are less concentrated. this process i

s called
Chemistry
1 answer:
lara31 [8.8K]3 years ago
4 0
Your answer would diffusion 
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Calculate the number of hydrogen atoms present in 40g of urea, (NH2)2CO
tekilochka [14]

Answer: There are 16.14 \times 10^{23} atoms of hydrogen are present in 40g of urea, (NH_{2})_{2}CO.

Explanation:

Given: Mass of urea = 40 g

Number of moles is the mass of substance divided by its molar mass.

First, moles of urea (molar mass = 60 g/mol) are calculated as follows.

Moles = \frac{mass}{molar mass}\\= \frac{40 g}{60 g/mol}\\= 0.67 mol

According to the mole concept, 1 mole of every substance contains 6.022 \times 10^{23} atoms.

So, the number of atoms present in 0.67 moles are as follows.

0.67 mol \times 6.022 \times 10^{23} atoms/mol\\= 4.035 \times 10^{23} atoms

In a molecule of urea there are 4 hydrogen atoms. Hence, number of hydrogen atoms present in 40 g of urea is as follows.

4 \times 4.035 \times 10^{23} atoms\\= 16.14 \times 10^{23} atoms

Thus, we can conclude that there are 16.14 \times 10^{23} atoms of hydrogen are present in 40g of urea, (NH_{2})_{2}CO.

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3 years ago
Which nonmetals have similar chemical properties? Check all that apply.
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Answer:

Sulfur

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You’re welcome:)

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3 years ago
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Zz. Compound A is crystalline, has a high melting point, and is more conductive when dissolved. Compound B is highly conductive
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Compound C is covalent.

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Among the properties of a covalent compound is that it has poor conductivity and could possibly be a gas at room temperature.

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