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4 years ago

John walks at a steady speed if 3 mph. How long will it take him to travel 24 miles?

Chemistry

2 answers:

larisa86 [58]4 years ago

4 0

It will take John 8 hours. 24÷3=8

Setler79 [48]4 years ago

3 0

I know for a fact that it would be 8 mph

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How many sulfur atoms are present in 25.6 g of Al2(S2O3)3

IgorC [24]

Given the mass of $Al_{2}(S_{2}O_{3})_{3}$ =25.6 g

The molar mass of $Al_{2}(S_{2}O_{3})_{3}$ =390.35g/mol

Converting mass of $Al_{2}(S_{2}O_{3})_{3}$ to moles:

$25.6 g Al_{2}(S_{2}O_{3})_{3}*\frac{1molAl_{2}(S_{2}O_{3}}{390.35 gAl_{2}(S_{2}O_{3}} =0.0656molAl_{2}(S_{2}O_{3}$

Converting mol $Al_{2}(S_{2}O_{3})_{3}$ to mol S:

$0.0656mol Al_{2}(S_{2}O_{3})_{3}*\frac{6molS}{1mol Al_{2}(S_{2}O_{3})_{3}}=0.3936 molS$

Converting mol S to atoms of S using Avogadro's number:

1 mol = $6.022*10^{23}atoms$

$0.3936mol S *\frac{6.022*10^{23}atoms S}{1 mol S}=2.37*10^{23} S atoms$

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3 years ago

35. a

Mashutka [201]

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3 years ago

The coefficients in a balanced chemical equation represent

jolli1 [7]

(l ) the mass ratios of the substances in the reaction
<u>(2) the mole ratios of the substances in the reaction</u>
(3) the total number of electrons in the reaction
<span>(4) the total number of elements in the reaction</span>

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3 years ago

When in contact with hydrochloric acid, which mineral gives off bubbles of carbon dioxide gas?.

xxTIMURxx [149]

Answer:

Calcite

Explanation:

When in contact with hydrochloric acid, calcite releases carbon dioxide gas.

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3 years ago

What is moment and its calculations

PIT_PIT [208]

Answer:

Moment=Force x Pivot

Explanation:

A moment is the turning effect of a force. Moments act about a point in a clockwise or anticlockwise direction.

Law of moments:

When an object is balanced (in equilibrium) the sum of the clockwise moments is equal to the sum of the anticlockwise moments.

How to calculate moments:

Moment=Force x Pivot

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3 years ago