Which answer below could represent velocity?<br> A. 45 mph<br> B. 45 mph N<br> C. 45 mph(2)

6. —K,Cr,0,+ --L1,0—<br> Combustion reaction

zimovet [89]

Answer:

efef

Explanation:

8 0

3 years ago

The chemical symbol for helium is H

Komok [63]

Answer:No, it is He

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7 0

3 years ago

A 8.249 gram sample of copper is heated in the presence of excess fluorine. A metal fluoride is formed with a mass of 13.18 g. D

levacccp [35]

Answer:

$CuF_2$ the empirical formula of the metal fluoride.

Explanation:

Mass of copper heated = 8.249 g

Mass of copper fluoride formed = 13.18 g

Mass of fluorine gas in copper fluoride = x

$13.18 g = 8.249 g + x\\x= 13.18 - 8.249 g = 4.931 g$

Moles of copper :

$= \frac{8.249 g}{63.546 g/mol}=0.1298 mol$

Moles of fluorine:

$= \frac{4.931 g}{18.998 g/mol}=0.2596 mol$

For the empirical formula divide the smallest mole of an element with all the moles of elements present in the compound.

$Copper= \frac{0.1298 mol}{0.1298 mol}=1\\Fluorine = \frac{0.2596 mol}{0.1298 mol}=2$

The empirical formula of the copper fluoride = $CuF_2$

$CuF_2$ the empirical formula of the metal fluoride.

6 0

3 years ago

The flask contains 10.0mL of HCl and a few drops of phenolphthalein indicator. The buret contains 0.320 M NaOH. What is the init

yan [13]

This question is incomplete, the complete question is;

The flask contains 10.0mL of HCl and a few drops of phenolphthalein indicator.

The buret contains 0.320 M NaOH,

It requires 11.2 mL of the NaOH solution to reach the end point of the titration

What is the initial concentration of HCI?

Answer:

initial concentration of HCl is 0.3584 M

Explanation:

Given that;

the reaction between HCl and NaOH is 1:1 molar

HCl(aq) + NaOH(aq) -------> NaCl(aq) + H2O(l)

we know that molarity is the number of moles of solute per liter of solution

so moles of NaOH consumed

= ( 0.320 mol / 1000ml) × 11.2ml

= 0.003584 mol

now

0.003584 moles of NaOH reacts with 0.003584 moles of HCl

moles of HCl present in the 10.0ml solution = 0.003584 mol

therefore the initial concentration of HCl

= ( 0.003584 mol / 10.0ml )× 1000ml

= 0.3584 M

the initial concentration of HCl is 0.3584 M

5 0

3 years ago

Calculate the value of ka for acetylsalicylic acid

lianna [129]

The value of Ka for acetylsalicylic acid will be calculated as Ka=(x+a)²/x.

Ka is known by the name of acid dissociation constant and for weak acid HA at equilibrium Ka will be calculated as:

Ka = [H⁺][A⁻] / [HA]

Chemical equation with ICE table for the acetylsalicylic acid will be shown as:

C₉H₈O₄(aq) + H₂O(l) ⇄ C₉H₇O₄(aq) + H₃O⁺(aq)

Initial: x 0 0

Change: -a +a +a

Equilibrium: x-a x+a x+a

So, Ka for acetylsalicylic acid will be calculated by putting values on the above equation as:

Ka = [x+a][x+a] / [x-a]

Value of a is negligible as compared to the value of x of acetylsalicylic acid so the term x-a becomes x and equation will be written as:

Ka = (x+a)² / x

By knowing the all values of concentration we can calculate the value of Ka.

Hence Ka value for acetylsalicylic acid will be calculated by using the formula as Ka = (x+a)² / x.

To know more about Ka, visit the below link:

brainly.com/question/26998

#SPJ4

5 0

2 years ago

Which answer below could represent velocity? A. 45 mph B. 45 mph N C. 45 mph(2)