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adelina 88 [10]
3 years ago
10

Please help me with these 3 questions with will be giving out brainiest

Chemistry
1 answer:
Anna71 [15]3 years ago
5 0

Answer: All of them are true

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Answer:

44.01amu?

Explanation:

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3 years ago
The balanced reaction equation for combustion of heptane, C7H16, is
Allisa [31]

Answer: m = 11.2 g C7H16

Explanation: First convert the mass of CO2 to moles. Then do the mole ratio between CO2 and C7H16 which is 7:1. Finally convert the moles of C7H16 to the mass of C7H16.

Solution attached.

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3 years ago
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It didn't have science but the subject is science. A climate with short cool summers and long, bitterly cold winters is the
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Hey there,

Question : <span>A climate with short cool summers and long, bitterly cold winters is the?

Answer : D, Tundra Climate

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La formula quimica de la molecula de agua H20 , si H = 1 gramos y O = 16 gramos . Cual es su composicion porcentual ? 88,88 % de
vesna_86 [32]

Answer:

88,88 % de O y 11,11 % de H

Explanation:

La composición porcentual se define como la masa que hay de cada mol de átomo en 100g. Las moles de agua en 100g son:

<em>Masa molar agua:</em>

2H = 2*1g/mol = 2g/mol

1O = 1*16g/mol = 16g/mol

Masa molar = 2 + 16 = 18g/mol

100g H2O * (1mol / 18g) = 5.556 moles H2O.

Moles de hidrógeno:

5.556 moles H2O * (2mol H / 1mol H2O) = 11.11 moles H

Moles Oxígeno = Moles H2O = 5.556 moles

La masa de hidrógeno es:

11.11mol * (1g/mol) 11.11g H

La masa de oxígeno es:

5.556 mol * (16g / 1mol) = 88.89g O

Así, el porcentaje de O es 88.89% y el de H es 11.11%. La opción correcta es:

<h3>88,88 % de O y 11,11 % de H</h3>
7 0
3 years ago
What does the periodic table have in common with a calendar?
Angelina_Jolie [31]

Answer:

Calendar and periodic table both have repetitive patterns.

Explanation:

In calendar the days are arranged and divided into weeks whereas in the periodic table the elements are arranged in increasing atomic number and divided into groups

5 0
4 years ago
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