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2 years ago

How many significant figures are in 5.40

1 answer:

4 0

There are 3 significant figures in this value, all values before and after the decimal point are significant. As there is a decimal point, the zeros trailing are also significant.

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I'm in a rush please help

Alexeev081 [22]

16) <

17) >

18) =

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4 0

3 years ago

What are the reagents for BaCO3(s)

Wittaler [7]

The reagents for BaCO₃ is

BaO and CO₂

Explanation

Reagent is a substance that bring about a chemical reaction when added to a system.

Some reagent may be added to see if a reaction has occurred.

BaO and Co₂ are reagent since they react to produce BaCO₃ as below

BaO(s) + CO₂(g) → BaCO3(s)

6 0

2 years ago

What is the limiting reactant for the following balanced equation when 9 moles of AlF3 are mixed with 12 miles of O2?

tamaranim1 [39]

<h2>Answer: $AlF_{3}$ </h2>

Explanation:

The chemical equation of the reaction that occurs when $AlF_{3}$ reacts with $O_{2}$ is

$4AlF_{3}+3O_{2}$ → $2Al_{2}O_{3}+6F_{2}$

$4$ moles of $AlF_{3}$ requires $3$ moles of $O_{2}$ .

$1$ mole of $AlF_{3}$ requires $\frac{3}{4}$ moles of $O_{2}$ .

Given that we have $9$ moles of $AlF_{3}$ .

$9$ moles of $AlF_{3}$ requires $\frac{3}{4}\times 9=6.75$ moles of $O_{2}$ .

But we have $12$ moles of $O_{2}$ .

So, $AlF_{3}$ will be consumed first.

So, $AlF_{3}$ is the limiting reagent.

3 0

2 years ago

what is the percent by mass of a solution that contains 30 grams of potassium nitrite in 0.5 kilograms of water?

Makovka662 [10]

Answer:

5.66 %.

Explanation:

mass percent is the ratio of the mass of the solute to the mass of the solution multiplied by 100.

mass % = (mass of solute/mass of solution) x 100.

mass of potassium nitrite = 30.0 g,

mass of the solution = mass of water + mass of potassium nitrite = 500.0 g + 30.0 g = 530.0 g.

∴ mass % = (mass of solute/mass of solution) x 100 = (30.0 g/530.0 g) x 100 = 5.66 %.

5 0

2 years ago

Is a landslide an example of erosion or weathering

Shtirlitz [24]

Answer:

It is a example of erosion

Explanation: because pieces of rock erode making it unstable a causes a landslide

7 0

2 years ago