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2 years ago

1. Which of these is the basic unit of mass?

Chemistry

2 answers:

jeka57 [31]2 years ago

7 0

1.)B 2.)C 3.)A 4.)B 5.)C

Juli2301 [7.4K]2 years ago

4 0

1) the basic unit of mass (SI unit) is Kg

2) the amount of matter in an object is known as density, infact the amount of matter in a unit volume is density

3) We can measure the mass with a balance

Burette: for volume

rule : for length

graduated cylinder : for volume

4) Weight is measure of force of gravity on a matter

5) the density of water = 1 g / mL at 4 C

so mass of 1 mL of water will be equal to 1 gram

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What volume (in mililiters) of oxygen gas is required to react with 4.03 g of my at stp

goldenfox [79]

You must use 1880 mL of O₂ to react with 4.03 g Mg.

A_r: 24.305

2Mg + O₂ ⟶ 2MgO

Moles of Mg = 4.03 g Mg × (1 mol Mg/24.305 g Mg) = 0.1658 mol Mg

Moles of O₂ = 0.1658 mol Mg × (1 mol O₂/2 mol Mg) = 0.082 90 mol O₂

STP is 25 °C and 1 bar. At STP, 1 mol of an ideal gas has a volume of 22.71 L.

Volume of O₂ = 0.082 90 mol O₂ × (22.71 L O₂/1 mol O₂) = 1.88 L = 1880 mL

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2 years ago

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AveGali [126]

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2 years ago

A gas evolved during the fermentation of alcohol had a volume of 19.4 L at 17 °C and 746 mmHg. How many moles of gas were collec

AlexFokin [52]

Answer:- 0.800 moles of the gas were collected.

Solution:- Volume, temperature and pressure is given for the gas and asks to calculate the moles of the gas.

It is an ideal gas law based problem. Ideal gas law equation is used to solve this. The equation is:

PV=nRT

Since it asks to calculate the moles that is n, so let's rearrange this for n:

$n=\frac{PV}{RT}$

V = 19.4 L

T = 17 + 273 = 290 K

P = 746 mmHg

we need to convert the pressure from mmHg to atm and for this we divide by 760 since, 1 atm = 760 mmHg

$P=746mmHg(\frac{1atm}{760mmHg})$

P = 0.982 atm

R = $0.0821\frac{atm.L}{mol.K}$

Let's plug in the values in the equation to get the moles.

$n=\frac{0.982atm*19.4L}{0.0821\frac{atm.L}{mol.K}*290K}$

n = 0.800 moles

So, 0.800 moles of the gas were collected.

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3 years ago

Natural remedies are usually more effective and safer because they have thoroughly tested .

mihalych1998 [28]

The answer for this question would be B) False or the second option.

Answer is FALSE: ✅

6 0

3 years ago

Draw the structure of the bromohydrin formed when (Z)-3-hexene reacts with Br2/H2O. Use the wedge/hash bond tools to indicate st

Ipatiy [6.2K]

Answer:

(3R,4R)-4-bromohexan-3-ol

Explanation:

In this case, we have reaction called halohydrin formation. This is a markovnikov reaction with anti configuration. Therefore the halogen in this case "Br" and the "OH" must have different configurations. Additionally, in this molecule both carbons have the same substitution, so the "OH" can go in any carbon.

Finally, in the product we will have chiral carbons, so we have to find the absolute configuration for each carbon. On carbon 3 we will have an "R" configuration on carbon 4 we will have also an "R" configuration. (See figure 1)

I hope it helps!

5 0

3 years ago