All categories

3 years ago

Can you help me solve this ?

Chemistry

1 answer:

Liula [17]3 years ago

5 0

All of the above are true

Have a great day!

You might be interested in

What expression approximates the volume of O2 consumed, measure at STP, when 55 g of Al reacts completely with excess O2?2 Al(s)

nikdorinn [45]

Answer : The volume of $O_2$ consumed are, $0.75\times 2\times 22.4$ L.

Explanation :

The balanced chemical reaction will be:

$4Al(s)+3O_2(g)\rightarrow 2Al_2O_3(s)$

First we have to calculate the moles of Al.

$\text{Moles of }Al=\frac{\text{Mass of }Al}{\text{Molar mass of }Al}$

Molar mass of Al = 27 g/mole

$\text{Moles of }Al=\frac{55g}{27g/mol}=2mole$

Now we have to calculate the moles of $O_2$ .

From the reaction we conclude that,

As, 4 mole of Al react with 3 moles of $O_2$

So, 2 mole of Al react with $\frac{3}{4}\times 2=0.75\times 2$ moles of $O_2$

Now we have to calculate the volume of $O_2$ consumed.

As we know that, 1 mole of substance occupies 22.4 liter volume of gas.

As, 1 mole of $O_2$ occupies 22.4 liter volume of $O_2$ gas

So, $0.75\times 2$ mole of $O_2$ occupies $0.75\times 2\times 22.4$ liter volume of $O_2$ gas

Therefore, the volume of $O_2$ consumed are, $0.75\times 2\times 22.4$ L.

3 0

3 years ago

Arrange the following molecules in order of increasing bond polarity (highest bond polarity at the bottom):

Tom [10]

NF3– 0.94– third
NCl3–0.12– second
NBr3–0.08– first
CF4–1.43– fourth

NBr3—NCl3—NF3—CF4
Lowest. Highest

4 0

3 years ago

Suppose you have 50 grams of a radioactive isotope with a half-life of 2 years. How much of the isotope will you have after 4 ye

lys-0071 [83]

C would be the best answer

5 0

3 years ago

Read 2 more answers

A researcher studying the nutritional value of a new candy places a 4.70g sample of the candy inside a bomb calorimeter and comb

Luba_88 [7]

Answer:

Calories of candy = 5.1 kcal /g

Explanation:

Given data:

Mass of candy = 4.70 g

Change in temperature = 2.46 °C

Specific heat capacity of calorimeter = 40.50 Kj/°C

Calories present per gram = ?

Solution:

Formula

Cal of candy = specific heat capacity × change in temperature / mass

C = c . ΔT/m

C = 40.50 Kj/°C × 2.46 °C / 4.70 g

C = 99.63 kj /4.70 g

C = 21.2 kj/ g

C = 21.2 kj/ g × 0.239 kcal/kj

C = 5.1 kcal /g

3 0

3 years ago

Define all the physical features of earth

Aleks [24]

<h3>The features discussed are: Plateaus, deserts, deltas, mesas, basins, foothills, marshes, and swamps. Plateaus are elevated regions that are flat on top. Deserts are large areas that receive less than 10 inches of precipitation a year. Antarctica is the world's largest desert.Geography Landforms & Physical Features. Our Earth is made up of a many different types of landforms. ... Mountains. Mountains are large, tall, and elevated land areas on the earth's surface that rise abruptly from the surrounding land area. .</h3>

<h2>hope it helps</h2><h2>stay safe healthy and happy.....</h2>

5 0

3 years ago

Read 2 more answers