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Angelina_Jolie [31]
3 years ago
12

For what value of a does (one-ninth) Superscript a 1 Baseline = 81 Superscript a 1 Baseline times 27 Superscript 2 minus a? –4 –

2 2 6.
SAT
1 answer:
7nadin3 [17]3 years ago
4 0

Answer:

-4

Explanation:

Edge.

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How many moles of h2o are produced when 64. 0 g c2h2 burn in oxygen?.
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Balance the combustion reaction:

a C₂H₂ + b O₂   →   c CO₂ + d H₂O

Count the atoms on both sides of the reaction:

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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,

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

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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.

3 0
2 years ago
Is 2 and 7/8 ths greater than 2.75
hjlf
2 and 7/8 is not great than 2.75 because 7/8 in decimal form is .875 and 2 needs to be a great number 2.75 so no it is not .
8 0
4 years ago
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hope this helps

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