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Nataly [62]
3 years ago
12

5.40(10)+2.50(x)=3.00(10+x) Solve

Mathematics
1 answer:
iris [78.8K]3 years ago
3 0

Answer:

x=48

Step-by-step explanation:

5.40(10)+2.50(x)=3.00(10+x)\\\\54.0+2.50x=3.00(10)+3.00(x)\\\\54+2.5x=30.0+3.00x\\\\54+2.5x=30+3x\\\\54+2.5x-2.5x=30+3x-2.5x\\\\54+0=30+(3-2.5)x\\\\54=30+0.5x\\\\54-30=30+0.5x-30\\\\24=0.5x\\\\10(24)=10(0.5x)\\\\240=5x\\\\\frac{1}{5} (240)=\frac{1}{5} (5x)\\\\48=x\\\\x=48

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Only answer 28 ( I added this parentheses so that the thing would accept my question)
avanturin [10]

Answer:

(a). Number of protons in a chlorine atom = 17

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Step-by-step explanation:

Let the number of protons in a sodium atom = <em>x</em>

Then, the number of protons in a chlorine atom =<em> x</em> + 6

Now, it is given that the atomic number of an element is equal to the number of protons per atom.

So, atomic number of sodium (Na) = <em>x</em>

Atomic number of chlorine (Cl) = <em>x</em> + 6

It is given that the atomic number of chlorine is 5 less than twice the atomic number of sodium.

∴ atomic number of chlorine (Cl) = 2 × atomic number of sodium (Na) - 5

⇒ <em>x</em> + 6 = 2<em>x</em> - 5

⇒ <em>x </em>- 2<em>x</em> = -5 - 6

⇒ -<em>x</em> = -11

Cancelling the minus sign from both sides, we get

<em>x</em> = 11

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                                                                     = 11 + 6      (∵ <em>x</em> = 11)

                                                                     = 17

(b). Atomic number of sodium = <em>x</em> = 11

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<h2 />
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