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Alik [6]
3 years ago
8

The product of the measurements 2.05 cm x 32 cm should be rounded to

Chemistry
1 answer:
Bas_tet [7]3 years ago
7 0

Answer:

Two significant figures

Step-by-step explanation:

In <em>multiplication </em>problems, your answer can have no more significant figures than the number with the <em>fewest significant figures</em>.

2.05 cm × 32 cm = 65.600 000 00 cm² (by my calculator)

There are three significant figures in 2.05, but only two in 32.

You must round to <em>two</em> significant figures and report the answer as 66 cm².

65.600 000 00 cm² ⟶ 66 cm²  

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The combustion of ethyne, shown below unbalance, produces heat which can be used to weld metals:
Andreyy89

Answer:

3.69 g

Explanation:

Given that:

The mass m = 325 g

The change in temperature ΔT = ( 1540 - 165)° C

= 1375 ° C

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The amount of heat required:

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The equation for the reaction is expressed as:

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Then,

1 mole of the ethyne is equal to 26 g of ethyne required for 1544 kJ heat.

Thus, for 218.97 kJ, the amount of ethyne gas required will be:

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3 0
3 years ago
A chemist dissolves 797. mg of pure barium hydroxide in enough water to make up 60. mL of solution. Calculate the pH of the solu
topjm [15]

Answer:

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Step 2: Calculate the molar concentration of Ba(OH)₂

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7 0
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Exercise 4.1
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I got no idea so sorry .

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