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Sindrei [870]
4 years ago
13

What is 5.1821 x 10^-4 in standard format

Chemistry
1 answer:
Darya [45]4 years ago
4 0
The answer is 1.39E-7
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How much heat, in joules and in calories, must be added to a 75.0–g iron block with a specific heat of 0.449 j/g °c to increas
lianna [129]

Answer:

Q=50,849.25J\\\\Q=12,153.3cal

Explanation:

Hello!

In this case, given the mass, temperature change and specific heat, it is possible to compute the required heat in joules as shown below:

Q=mC(T_2-T_1)\\\\Q=75.0g*0.449\frac{J}{g\°C}(1535\°C-25\°C)\\\\Q=50,849.25J

Now, since 1 cal =4.184 J, this result in calories is:

Q=50,849.25J*\frac{1cal}{4.184J}\\\\Q=12,153.3cal

Best regards!

7 0
3 years ago
HSiCl3+H2O=H10Si10O15+HCl
tiny-mole [99]

10 HSiCl3+ 15 H2O→H10Si10O15+ 30 HCl

Explanation:

Step 1: To make Si equal on both sides. put 10 in front of HSiCl3

10 HSiCl3+ H2O →H10Si10O15+ HCl

Step 2: By putting 30 in front of HCl, Cl can be balanced

10 HSiCl3+ H2O →H10Si10O15+ 30 HCl

Step 3: Now, balance O by putting 15 in front of H2O

10 HSiCl3+ 15 H2O→H10Si10O15+ 30 HCl

Hence the balanced equation is:

10 HSiCl3+ 15 H2O→H10Si10O15+ 30 HCl

5 0
4 years ago
3.00 moles of gas are pumped into a 1.00L rigid container with a pressure of 1.98 atm. The gas is released from the container un
guajiro [1.7K]

Answer:

1.18 moles of gas

Explanation:

3.00 moles of gas are pumped into a 1.00L rigid container with a pressure of 1.98 atm. The gas is released from the container until the pressure is 0.78 atm, how many moles of gas remain in the container?​

for the sealed rigid container, the pressure is directly proportional to the amount of gas

3.00moles/1.98  atm =  ? moles/0.78 atm

? = 3.00 X 0.78/1.98  =1.18 moles of gas

8 0
3 years ago
How many bonds are formed between 2 Hydrogen atoms in an H2 molecule?
exis [7]
<h3>Answer:</h3>

Have a <em>strong</em><em> </em><em><u>polar</u></em><em><u> </u></em><em><u>attractio</u></em><em><u>ns</u></em><em><u> </u></em>between <em><u>molecule</u></em><em><u>'s</u></em><em><u> </u></em><em><u> </u></em><em><u>involvin</u></em><em><u>g</u></em><em><u> </u></em><em><u>H</u></em><em><u>,</u></em><em><u> </u></em><em><u>F</u></em><em><u>,</u></em><em><u> </u></em><em><u>O</u></em><em><u> </u></em><em><u>and</u></em><em><u> </u></em><em><u>N</u></em><em><u>.</u></em>

SUBMIT!

<em><u>hope</u></em><em><u> </u></em><em><u>it</u></em><em><u> </u></em><em><u>help</u></em><em><u>s</u></em>

4 0
3 years ago
Why is it necessary to include units when reporting scientific measurements?
Kay [80]

Without units, the results of your measurement would be unclear and it would be hard to know what each seperate measurement is telling you.

5 0
3 years ago
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