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dalvyx [7]
3 years ago
7

A student is asked to convert measurements from grams to kilograms and from kilograms to grams. His answers are shown in bold in

the choices shown below. On which choice did he make a mistake? 765 g = 0.765 kg 10.1 g = 0.0011 kg 1000 g = 1 kg 5.44 g = 0.00544 kg
Chemistry
2 answers:
german3 years ago
8 0
It has to be 2 hope this helps

MA_775_DIABLO [31]3 years ago
5 0

Answer:

10.1 g = 0.0011 kg is incorrect

Explanation:

When converting from g to kg we divide by 1000 and when converting from kg to g we multiply by 1000.

765 g = 0.765 kg is correct since 1 kg = 1000 g  

10.1 g = 0.0011 kg is incorrect since 1 kg = 1000 g

10.1 g = 0.0101 kg is correct

1000 g = 1 kg is the correct conversion factor

5.44 g = 0.00544 kg is correct since 1 kg = 1000 g

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What is the pH of a mixture of 0.042 M NaH2PO4 and 0.058 M Na2HPO4? Hint: The pKa of phosphate is 6.86.
AlekseyPX

Answer:

The pH value of the mixture will be 7.00

Explanation:

Mono and disodium hydrogen phosphate mixture act as a buffer to maintain pH value around 7. Henderson–Hasselbalch equation is used to determine the pH value of a buffer mixture, which is mathematically expressed as,

pH=pK_{a} + log(\frac{[Base]}{[Acid]})

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3 years ago
Suppose it took 108 joules of energy to raise a bar of gold from 25 °C to 29.7°C. Given that the specific heat capacity of gold
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Answer:

m = 180 g

Explanation:

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Energy absorbed = 108 J

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Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

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