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stich3 [128]
3 years ago
11

What’s this answer help me out

Chemistry
1 answer:
Paladinen [302]3 years ago
3 0
Sorry my guy no idea try googling
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Identifying compounds Caffeine is the most widely used psychoactive drug in the world and is found in coffee beans, tea leaves,
Marina CMI [18]

Answer:

Matter

Compound

Explanation:

Caffeine is NOT an Element, because it is formed by different elements (C, H, N, and O).

Caffeine is NOT an Isotope, because this only applies to elements with the same atomic number but different mass number.

Caffeine is Matter because it has mass and occupies space by having volume.

Caffeine is a Compound because it has a formula with a <em>definite constant composition</em> of different elements.

4 0
3 years ago
In an ionic bond, electrons are ___________________. Choose all the apply.
Rainbow [258]
In an ionic bond, electrons are transferred from one stone to another atom (shared).
4 0
2 years ago
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Which is not a name to describe global winds A) Polar Easterlies B) Prevailing Westerlies C) Trade Winds D) Tropical Northerlies
SVEN [57.7K]
D Tropical northerlies
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3 years ago
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The density of concentrated ammonia, which is 28.0% w/w nh3, is 0.899 g/ml. what volume of this reagent should be diluted to 1.0
vlada-n [284]

Answer: 2.4 ml

Solution :

Molar mass of NH_3 = 17 g/mole

Given,: 28% w/w of NH_3 solution means 28 g of ammonia in 100 g of solution.

Mass of solution = 100 g

Now we have to calculate the volume of solution.

Volume=\frac{Mass}{Density}=\frac{100g}{0.899g/ml}=111.2ml  

Molarity : It is defined as the number of moles of solute present in one liter of solution.

Molarity=\frac{n\times 1000}{V_s}

where,

n = moles of solute NH_3=\frac{\text {given mass}}{\text {molar mass}}=\frac{28}{17}=1.65moles

V_s = volume of solution in liter = 0.11 L

Now put all the given values in the formula of molarity, we get

Molarity=\frac{1.65moles}{0.11L}=15mole/L

Using molarity equation:

M_1V_1=M_2V_2

15\times V_1=0.036\times 1.0\times 10^{3}

V_1=2.4ml

6 0
3 years ago
40. What is the mass of 3 moles of H 2 O
Leya [2.2K]

Answer:

54g

Explanation:

Given parameters:

Number of moles of H₂O  = 3 moles

Unknown:

mass of water  = ?

Solution:

To solve this problem, we use the expression below:

         mass  = number of moles x molar mass

Molar mass of H₂O  = 2(1)  + 16  = 18g/mol

Mass of water  = 3 x 18  = 54g

3 0
3 years ago
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