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2 years ago

How does using a jack make changing a tire easier

1 answer:

8 0

when using a jack it lifts up the car for you, giving you the ability to remove and replace a tire without the weight of the car on the tire.

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< Progress: 19/21 groups Due Jan 15 at 11:55 PM Use the References to access important values if needed for this question. Th

Ierofanga [76]

Answer:

CoSO4.7H2O

Cobalt II tetraoxosulphate VI heptahydrate

Explanation:

According to IUPAC nomenclature, compounds are named systematically.

We were told that there are seven water molecules in each formula unit Hence the correct formula of the compound is CoSO4.7H2O

According to IUPAC system, the metal is first named, followed by its oxidation state in Roman numerals. Then the name of the anion is mentioned as well as the number of water molecules. We have to take into account the correct prefix signifying the number of molecules of water of crystallization.

6 0

2 years ago

We add a 1.20-g sample of dry ice to a 755-mL flask containing nitrogen gas at a temperature of 25.0 C and a pressure of 725mmHg

yaroslaw [1]

Answer:

Total pressure is 1396 mmHg

Explanation:

By:

PV/RT = n

It is possible to obtain the initial moles of nitrogen gas, where:

P is pressure (725 mmHg = 0,954 atm)

V is volume (0,755L)

R is gas constant (0,082atmL/molK)

T is temperature (25,0°C = 298,15 K)

Replacing:

n = 0,02946 moles of nitrogen gas.

The moles of dry ice (CO₂; molar mass= 44,01 g/mol) are:

1,20 g × (1mol/44,01g) = 0,02727 moles of dry ice.

When dry ice sublimes, total moles are:

0,02727 + 0,02946 =<em> 0,05673 moles</em>

With the temperature (25,0°C = 298,15 K) and volume (0,755L) it is possible to obtain total pressure, thus:

P = nRT/V

Replacing:

P = 1,837 atm × (760 mmHg/1atm) = <em>1396 mmHg</em>

I hope it helps!

3 0

2 years ago

Help please!!!!!!!!!!!!!!!!!!!!!!!!!!!

NeX [460]

Im in the 10th grade and i got not a clue how to do this dawg

6 0

2 years ago

Read 2 more answers

Dilute aqueous hydrogen peroxide is used as a bleaching agent and for disinfecting surfaces and small cuts. its concentration is

finlep [7]

7.62 grams.

<h3>Explanation</h3>

According to the question, 0.125 L of the 20 "volumes hydrogen peroxide" solution would decompose to produce $0.125 \times 20 = 2.5 \; \text{L}$ of oxygen gas.

The question indicates that the volume of $\text{O}_2$ here is measured under STP, which means that every $\text{mol}$ of gas would have a volume of $22.4 \; \text{L}$ . There would thus be $2.5 / 22.4 = 0.112 \; \text{mol}$ of molecules in the 2.5 L of $\text{O}_2$ produced.

$2\; \text{H}_2\text{O}_2\; (aq)\to 2\; \text{H}_2\text{O} \; (l) + \text{O}_2 \; (g)$

It takes two moles of hydrogen peroxide to produce one mole of oxygen. The unknown solution must contain 0.224 mol of hydrogen peroxide to produce all the 0.112 mol of oxygen.

Hydrogen peroxide has a formula mass of $34.02$ , meaning that each mole of it would have a mass of 34.02 grams. 0.224 mol of $\text{H}_2\text{O}_2$ would thus have a mass of $0.224 \times 34.02 = 7.62 \; \text{g}$

7 0

2 years ago

Read 2 more answers

Give the name of the reaction that does not achieve the theoretical limits with respect to free energy in thermodynamics. give t

Sunny_sXe [5.5K]

I believe the answer is irreversible reaction. An irreversible reaction is a reaction where the reactants convert to products and here the products cannot be able to convert back into the reactants. Examples of this kind of reaction is a combustion reaction that produces to stable compounds.

3 0

2 years ago