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2 years ago

Please help me asap thank you

Chemistry

1 answer:

solong [7]2 years ago

7 0

Answer:

5.a

6.d

7.c

Explanation:

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What is the difference between the molar mass and the empirical formula mass of a compound? when are these masses the same, and

fomenos

Molar mass is the mass of one stable molecule of a compound, that cannot join with another molecule of the same kind to form a new one, while an empirical formula is the molecular formula in its simplest form. E.g. empirical formula of ethene is CH2while its molecular formula is C2H4.

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3 years ago

A 1,500 kg truck is towed sideways out of a mud-hole with a force of 15,000 N. What acceleration of the tow truck is needed to m

NeX [460]

Yes because without movement the tow truck will not be moved with 15,000 N

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2 years ago

Mg + 2HCl → MgCl2 + H2

deff fn [24]

Answer:

Explanation:

This is a limiting reactant problem.

Mg(s)

2HCl(aq)

→

MgCl

(

)

+ H

(

)

Determine Moles of Magnesium

Divide the given mass of magnesium by its molar mass (atomic weight on periodic table in g/mol).

4.86

g Mg

mol Mg

24.3050

g Mg

0.200 mol Mg

Determine Moles of 2M Hydrochloric Acid

Convert

100 cm

100 mL

and then to

0.1 L

1 dm

1 L

Convert

2.00 mol/dm

2.00 mol/L

Multiply

0.1

times

2.00 mol/L

100

1000

0.1 L HCl

2.00 mol/dm

2.00 mol/L

0.1

2.00

mol

0.200 mol HCl

Multiply the moles of each reactant times the appropriate mole ratio from the balanced equation. Then multiply times the molar mass of hydrogen gas,

2.01588 g/mol

0.200

mol Mg

mol H

mol Mg

2.01588

g H

mol H

0.403 g H

0.200

mol HCl

mol H

mol HCl

2.01588

g H

mol H

0.202 g H

The limiting reactant is

HCl

, which will produce

0.202 g H

under the stated conditions.

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7 0

2 years ago

Read 2 more answers

If 61.5 moles of an ideal gas occupies 97.5 liters at 473 K, what is the pressure of the gas, in mmHg?

kiruha [24]

I’d say for the answer 13.13 mmHg?

5 0

2 years ago

You determine that it takes 26.0 mL of base to neutralize a sample of your unknown acid solution. The pH of the solution was 7.8

Lubov Fominskaja [6]

Complete Question

You determine that it takes 26.0 mL of base to neutralize a sample of your unknown acid solution. The pH of the solution was 7.82 when exactly 13 mL of base had been added, you notice that the concentration of the unknown acid was 0.1 M. What is the pKa of your unknown acid?

Answer:

The pK_a value is $pK_a =7.82$