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Grace [21]
4 years ago
7

Perform the forlowing

Chemistry
1 answer:
castortr0y [4]4 years ago
8 0

Answer:

\large \boxed{350}

Explanation:

In multiplication and division problems, the answer can have no more significant figures than the number with the fewest significant figures.

My calculator gives the result:

\dfrac{4568}{13} = 351.3846154

4658 has four significant figures.

     13 has two significant figures.

You must round to two significant figures.

That is, you drop all the digits to the right of the 5 — the red line in Fig. 1 below. You are rounding to the nearest ten.

To round a number to the nearest ten, you look at the number in the ones place (1). See Fig. 2.

If the number to be dropped — the digit in the ones place — is less than 5, you drop the digit in the ones place (Fig. 3). It becomes a zero.

The number in the tens place is a trailing zero. It is not significant.

\text{The quotient  of $\dfrac{4658}{13}$ is $\large \boxed{\mathbf{350}}$}

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2 years ago
Silver jewelry is a mixture of silver and copper. If a bracelet has a mass of 23.56 g, and it is 80.1% silver, the mass of silve
Reptile [31]

Answer:

  18.87 g

Explanation:

  80.1% of 23.56 g = 18.87 g is the mass of the silver

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3 years ago
The escape velocity from Earth's surface is 1.12 x 104 meters per second. At this speed, how many kilometers would a
Sati [7]

Answer:

2016 km

Explanation:

The escape velocity from Earth's surface is 1.12\times 10^4\ m/s.

We need to find how many kilometers would a  rocket travel in three minutes. It is a concept based on the definition of speed of an object.

Speed = distance per unit time

1 hour = 60 minutes

⇒ 3 minutes = 0.05 hour

1 m/s = 3.6 km/h

11200 m/s = 40320 km/h

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\text{distance}, d=v\times t\\\\d=40320\ km/h \times 0.05\ h\\\\d=2016\ km

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3 years ago
The reaction between potassium chlorate and red phosphorus takes place when you strike a match on a matchbox. If you were to rea
Alexus [3.1K]

25.55 grams of tetraphosphorus decaoxide could be produced by the reaction.

Explanation:

First the balanced chemical reaction of the production of tetraphosphorus decaoxide is to be known.

The chemical equation is

10 KClO3 + 3P4⇒ 3 P4010 + 10 KCl

The number of moles of KCLO3 will be calculated by the formula:

number of moles = mass of the compound given ÷ atomic mass of the compound

n = 37.1 ÷ 122.55     ( atomic mass of KClO3 is 122.55 gm/mole)

   = 0.30 moles

From the stoichiometry

10 moles of KClO3 is required to produce 3 moles of P4O10

when 0.30 moles of KClO3 is used x moles of P4O10 is formed

thus, 3 ÷ 10 = x ÷ 0.30

   = 0.09 moles of KClO3 is produced

To know the mass of P4O10 apply the formula

mass = number of moles × atomic mass

        = 0.09 × 283.886   ( atomic mass of P4O10 is 283.88 gram/mole)

         = 25.55 grams of P4O10 could be produced.

8 0
3 years ago
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