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4 years ago

What is the mass of 1.71 ✕ 1023 molecules of h2so4?

1 answer:

7 0

The equation for calculating a mass is as follows:

m=n×M

Molar mass (M) we can determine from Ar that can read in a periodical table, and a number of moles we can calculate from the available date for N:

n(H2SO4)=N/NA

n(H2SO4)= 1.7×10²³ / 6 × 10²³

n(H2SO4)= 0.3 mole

Now we can calculate a mass of H2SO4:

m(H2SO4) = n×M = 0.3 × 98 = 27.8 g

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Refer to the reaction between magnesium and oxygen In the introduction. What elements is oxidizing?write the oxidation number fo

erica [24]

Answer:

Oxidizing element: Mg

Explanation:

Reaction of magnesium and oxygen can be written as:

$2Mg +O_2 \rightarrow 2MgO$

while writting chemical reaction between two atom or element then write their natural form i.e. how that atom or element exist in the nature.

eg. reaction of any element with Oxygen atom then we can not write directly O because oxygen exist in the nature in form of $O_2$

finding oxidation number each side:

Reactant side:

Mg=0;

O=0;

product side:

Mg=+2;

O=-2;

from above:

oxidation number of Mg is increasing hence this is oxidizing element

7 0

3 years ago

What is the atomic theory timeline

Oxana [17]

A Timeline<span> on </span>Atomic Structure<span>. 400 B.C. Democritus' </span>atomic theory<span> posited that all matter is made up small indestructible units he called </span>atoms<span>. ... 1803 John Dalton proposed that elements consisted of </span>atoms<span> that were identical and had the same mass and that compounds were </span>atoms<span> from different elements combined together.</span>

8 0

3 years ago

Read 2 more answers

Balloon X is filled with the carbon monoxide. Balloon Y is filled to the same volume with carbon dioxide. The balloons are left

weqwewe [10]

Answer:

The smallest ballon is the ballon X

Explanation:

It is possible to answer this question by using Graham's law:

$\frac{v_1}{v_2} =\sqrt{\frac{MW_2}{MW_1}}$

Where v is the speed of effusion and MW is molar weight of each compound.

This equation is showing that speed is inversely related to the square root of its molar mass. As carbon dioxide has a bigger MW than carbon monoxide, the speed of effusion of carbon dioxide is lower doing its ballon biggest than carbon monoxide ballon, thus: <em>The smallest ballon is the ballon X</em>

I hope it helps!

6 0

3 years ago

If 30.0 g absorbs 255 J of heat, how much does the temperature of the water change? Would the temperature be increasing or decre

Nutka1998 [239]

<h3>Answer:</h3>

Change in temperature = 2.03°C, the temperature is increasing

<h3>Explanation:</h3>

To calculate the quantity of heat absorbed or released by a substance we multiply mass of the substance by it's specific heat capacity and the temperature change.
Therefore, Quantity of heat, Q = mass × specific heat × change in temperature

In this case;

Mass of water = 30.0 g

Quantity of heat absorbed = 255 J

Specific heat capacity of water = 4.186 J/g°C

Rearranging the formula, Δt = Q ÷ mc

Δt = 255 J ÷ (4.186 J/g°C×30.0 g )

= 2.03 °C

The temperature change is 2.03°C, the temperature is therefore increasing.

3 0

3 years ago

Importance of pH value in daily life

olganol [36]

Plants require pH to thrive which in turn gives us food.

8 0

3 years ago