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3 years ago

Use the mole concept to calculate the number of atoms that are in a 1.75-mol sample of CHCl3.

1 answer:

6 0

This is how I got to that answer. Since we don't know how many atoms there are in a mole, we use the number 6.02 x 10^-23. Now, just plug in what you have in the equation:

1.75 moles ChCl3 x (6.02 x 10 ^-23) / 1 mole = 1.0535 x 10^-22 atoms.

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If you react 156.0 g of calcium chloride with an excess NaOH, how much sodium chloride should you get?

laiz [17]

Answer:

164.3g of NaCl

Explanation:

Based on the chemical equation:

CaCl2 + 2NaOH → 2NaCl + Ca(OH)2

where 1 mole of CaCl2 reacts with 2 moles of NaOH

To solve this question we must convert the mass of CaCl2 to moles. Using the chemical equation we can find the moles of NaCl and its mass:

Moles CaCl2 -Molar mass: 110.98g/mol-

156.0g CaCl₂ * (1mol / 110.98g) = 1.4057 moles CaCl2

Moles NaCl:

1.4057 moles CaCl2 * (2mol NaCl / 1mol CaCl2) = 2.811 moles NaCl

Mass NaCl -Molar mass: 58.44g/mol-

2.811 moles NaCl * (58.44g / mol) = 164.3g of NaCl

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2 years ago

Match the correct simple with the correct elements of safety

grigory [225]

c. 12. preparing data tables and gathering safety equipment

b. 13. reading all instructions before beginning a science lab

a. 14. recognizing what a picture of a hand means

e. 15. wiping your work area with a wet paper towel

d. 16. wearing goggles and an apron

3 0

3 years ago

Which of the following is formed by intense heat and pressure over millions of years?

kumpel [21]

Answer:

B:Metamorphic

Explanation:

Rocks formed under high heat and pressure is essentially the definition of metamorphic rock :)

8 0

2 years ago

What is an organism that survives on a hist organism and cuases harm to the host

umka21 [38]

An organisam is part of your body plant life

5 0

3 years ago

Read 2 more answers

Please help me ASAP

MrRissso [65]

Answer:

<h2>answer will be D</h2>

change of state only 

8 0

3 years ago