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nadya68 [22]
3 years ago
14

Five more than two times the square root of a number is fifteen. What’s the number

Chemistry
2 answers:
ryzh [129]3 years ago
7 0
The number is 25. The square root of 25 is 5 and 5x2 is 10 and then 10+5 is 15
UkoKoshka [18]3 years ago
5 0
I think it may be 3 I’m not sure
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New Pressure of gas when temp is 235 k
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PV=nRT

P= (<span>0.0821L.atm/mol K)(235)/(22.4L/mol)
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5 0
2 years ago
One mole of a metallic oxide reacts with one mole of hydrogen to produce two moles of the pure metal
Rudiy27

Answer:

Lithium oxide, Li₂O.

Explanation:

Hello!

In this case, according to the given amounts, it is possible to write down the chemical reaction as shown below:

M_2O+H_2 \rightarrow 2M+H_2O

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5.00gM_2O*\frac{1molM_2O}{(2x+16)gM_2O}*\frac{2molM}{1molM_2O}*\frac{xgM}{1molM}   = 2.32gM

Thus, we perform the operations in order to obtain:

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So we solve for x as shown below:

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Whose molar mass corresponds to lithium, and therefore, the metallic oxide is lithium oxide, Li₂O.

Best regards!

8 0
3 years ago
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