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2 years ago

25 ml of liquid and has a mass of 19 grams. Calculate the density.

1 answer:

8 0

The density formula is mass divided by the volume. The mass in this case is 19 grams and the volume 25 ml.
The density is 0,76 g/ml.

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8. Calculate the number of moles of eachsubstance.a. 5.45 x 1026 particles of methane, CH4

Klio2033 [76]

ANSWER

The number of moles of methane is 905.32 moles

STEP-BY-STEP EXPLANATION:

Given information

The number of particles of methane = 5.45 x 10^26 particles

Let x represents the number of moles of methane

To calculate the number of moles, we will be using the below formula

$\text{Number of particles = number of moles x Avogadro's constant}$

Recall that, the Avogadro's constant is given as

$6.02\cdot10^{23}$ $\begin{gathered} 5.45\cdot10^{26}\text{ = x }\cdot\text{ 6.02 }\cdot10^{23} \\ \text{Divide both sides by 6.02 }\cdot10^{23} \\ x\text{ = }\frac{5.45\cdot10^{26}}{6.02\cdot10^{23}} \\ x\text{ = }\frac{5.45}{6.02}\cdot10^{26\text{ - 23}} \\ x\text{ = 0.9053 }\cdot10^3 \\ x\text{ = 905.32 moles} \end{gathered}$

Therefore, the number of moles of methane is 905.32 moles

6 0

1 year ago

Subscripts in a molecular formula indicate how many of each type of ____ can be found

bija089 [108]

Answer:

Atoms

Explanation:

The molecular formula uses chemical symbols to indicate the types of atoms followed by subscripts to show the number of atoms of each type in the molecule. :)

8 0

3 years ago

Draw the structures for the following compounds: 2-methylpropane

-Dominant- [34]

Answer:

Structure of 2-methylpropane.

Explanation:

The given compound is 2-methyl propane.

Propane has three carbons in their parent chain and all are bonded by a single bond.

And the second carbon has methyl group.

The structure of 2- methyl propane is as follows.

8 0

3 years ago

250 संतरे में से 50 संतरे एक कक्षा में बाँट दिए गए, तो कितने प्रतिशत संतरे बचे 1. 80% 2.25%

vagabundo [1.1K]

Answer:

80% left thanks hope ur day will fine

8 0

2 years ago

A child and her mother are at the park.The child walks around the rectangular park while her mom waits on a bench. The child ret

anygoal [31]

The displacement of the child : A. 0 m

<h3>Further explanation </h3>

Distance is a scalar quantity that indicates the length of the trajectory that is traveled by an object within a certain interval. Distance has no direction, only has a magnitude

Can be simplified distance = total meters traveled

Displacement is a vector quantity that shows changes in the position of objects in a certain interval of time. Displacement has magnitude and direction

Can be simplified displacement = distanced traveled from starting point to ending point

So the displacement of the child : 0 m

and the distance = the circumference of the rectangle :

$\tt =2(l+W)\\\\=2(475+411)\\\\=1772~m$

7 0

3 years ago