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2 years ago

Determine the mass in grams of 3.45 x 10^2 mol Co.

Chemistry

1 answer:

lara [203]2 years ago

6 0

Answer:

molar mass CO = 28.01 g/mol

3.45 x 10^2 x 28.01 =9.66 x 10^3 g

mass Zn = 2.45 x 10^-2 x 65.39 g/mol=1.60 g => 1.60 x 10^0

Explanation:

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Please do question 20 (help)

ValentinkaMS [17]

the rhino is A and the horse is B because if you see A and the rhino they're big. its logical

7 0

2 years ago

How much H2 is generated from the electrolysis of 150 grams of H2O

Romashka [77]

Answer:

16.67 grams of H₂ is generated from the electrolysis of 150 grams of H₂O

Explanation:

Electrolysis is the decomposition of a chemical element under the effect of an electric current. So, electrolysis of water is the process of decomposing the H₂O molecule into separate oxygen and hydrogen gases due to an electric current passing through the water.

The balanced equation of electrolysis of water is:

2 H₂O → O₂ + 2H₂

Being:

H: 1 g/mole
O: 16 g/mole

then the molar mass of the compounds that participate in the reaction is:

H₂O: 2*1 g/mole + 16 g/mole= 18 g/mole
H₂: 2*1 g/mole= 2 g/mole
O₂: 2*16 g/mole= 32 g/mole

If the following amounts in moles are reacted by stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction):

H₂O: 2 moles
H₂: 2 moles
O₂: 1 mole

the amount of mass, by stoichiometry, that reacts and is produced is:

H₂O: 2 moles*18 g/mole=36 g
H₂: 2 moles* 2 g/mole= 4 g
O₂: 1 mole* 32 g/mole= 32 g

Then you can apply the following rule of three: if by stoichiometry 36 g of H₂O generate 4 g of H₂, 150 g of H₂O how much mass of H₂ will it generate?

$massofH_{2} =\frac{150 grams of H_{2}O*4 grams ofH_{2} }{36 grams of H_{2}O}$

mass of H₂= 16.67 grams

16.67 grams of H₂ is generated from the electrolysis of 150 grams of H₂O

5 0

3 years ago

classify each solution as either an acid or a base using the properties that are stated. what are two ways these solutions are s

USPshnik [31]

Probably too late to help but solution a is likely a base while solution b is an acid.

two similar things: both are aqueous solution and they are not neutral.

6 0

3 years ago

Why would you not expect to find fossils in metamorphic and igneous rocks?

Marina CMI [18]

Answer:

igneous rocks are made from molten,and therefore rarely have fossils in them.Metamorphic rocks are squished,put under pressure,and get heated to the extreme,so it's very rare for fossils to survive in these conditions.

8 0

3 years ago

1. Fred is walking at 1.7 m/s, he sees a dollar and runs at 2.5 m/s in 1.5 seconds.

Firdavs [7]

Answer:

Acceleration is the rate of change of velocity. Usually, acceleration means the speed is changing, but not always. When an object moves in a circular path at a constant speed, it is still accelerating, because the direction of its velocity is changing.

Explanation:

It goes with velocity

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2 years ago