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3 years ago

A recreational runner has an average speed of 5.9 mph. How many km does she cover in 98 min?

Chemistry

1 answer:

mylen [45]3 years ago

7 0

Given

Speed = 5.9 miles / hour

1 mile = 1.609 km

1 hour = 60 min

Time given = 98 min

Convert miles to km, hours to min and calculate the distance for 98 min:

pic added above

Please cooperate with answer as am a new to brainly so I don't know much about it.

Thank you.

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Animals use oxygen in the process of blank and emit CO2 as a byproduct.

Temka [501]

Answer:

Respiration

Explanation:

The act of breathing, simple as that!

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2 years ago

The number of nitrogen atoms in one mole of nitrogen gas are...

9966 [12]

Explanation:

The number of nitrogen atoms in one mole of nitrogen gas are 6.02214179×1023 nitrogen atoms. 

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3 0

2 years ago

What is the mass of H2O

Dovator [93]

Answer:

The exact molecular mass is 18.01528 g/mol

Explanation:

Find this by adding the molecular masses of two hydrogen atoms and one oxygen atom.

8 0

2 years ago

A sample of pure NO2 is heated to 335 ∘C at which temperature it partially dissociates according to the equation 2NO2(g)⇌2NO(g)+

vodka [1.7K]

The equilibrium constant for the reaction is 0.00662

Explanation:

The balanced chemical equation is :

2NO2(g)⇌2NO(g)+O2(g

At t=t 1-2x ⇔ 2x + x moles

The ideal gas law equation will be used here

PV=nRT

here n= $\frac{w}{W}$ = $\frac{w}{V}$ = density

P = $\frac{density RT}{M}$ density is 0.525g/L, temperature= 608.15 K, P = 0.750 atm

putting the values in reaction

0.75 = $\frac{0.525 x 0.0821 x 608.15 }{M}$

M = 34.61

to calculate the Kc

Kc= $\frac{ [NO] [O2]}{NO2}$

$\frac{1-2x}{1+x}$ x M NO2 + $\frac{2x}{1+x}$ M NO+ $\frac{x}{1+x}$ M O2

Putting the values as molecular weight of NO2, NO,O2

$\frac{46(1-2x) +30(2x)+32x}{1+x}$

34.61= $\frac{46}{1+x}$

x= 0.33

Kc= $\frac{4x^2)x}{1-2x^2}$

putting the values in the above equation

Kc = 0.00662

5 0

2 years ago

The mass of a silver bracelet is 2.5 gram, it occupies a volume of 48cm3, what is its density?

NNADVOKAT [17]

Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume} \\$

From the question

mass = 2.5 g

volume = 48 cm³

The density is

$density = \frac{2.5}{48} \\ = 0.052083333...$

We have the final answer as

Hope this helps you

3 0

2 years ago