2 years ago

Approximately 10% of all people are left-handed. Consider a group of fifteen people.

SAT

1 answer:

Svetradugi [14.3K]2 years ago

3 0

M. E. R. P.

I need to do this so sorry

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Thank you just take the points.

mezya [45]

Answer:

<h3>Thank you for the points :D</h3>

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2 years ago

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How many moles of h2o are produced when 64. 0 g c2h2 burn in oxygen?.

blondinia [14]

Balance the combustion reaction:

a C₂H₂ + b O₂ → c CO₂ + d H₂O

Count the atoms on both sides of the reaction:

• C : 2a = c

• H : 2a = 2d

• O : 2b = 2c + d

Let a = 1; then c = 2 and d = 1, and it follows that

2b = 2•2 + 1 = 5

so that b = 5/2, and the balanced reaction is

1 C₂H₂ + 5/2 O₂ → 2 CO₂ + 1 H₂O

or, with integer coefficients,

2 C₂H₂ + 5 O₂ → 4 CO₂ + 2 H₂O

C₂H₂ has a molar mass of about 26.038 g/mol, so we have a starting amount of

(64.0 g) (1/26.038 mol/g) ≈ 2.46 mol C₂H₂

According to the reaction, we produce H₂O in a 1-to-1 ratio with the C₂H₂ that is burned up, so we end up with about 2.46 mol H₂O.

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2 years ago

Freezing and thawing water can cause a rock to break down into smaller pieces. Which part of the rock cycle is this an example o

alina1380 [7]

Physical Weathering

This especially happens with granitic rocks as they were cooling, like at Yosemite National Park. Freeze-thaw: When water freezes, it expands. If moisture seeps into cracks before winter, it can then freeze, driving the rocks apart.

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3 years ago

20 POINTS - What are some good ways to revise?

Artemon [7]

The answer is true

~hope this helps

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3 years ago

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elixir [45]

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hope this helps you.