Which of the following best explains why the oceanic crust is youngest at the oceanic ridges?

2 answers:

Pie3 years ago

6 0

D - Continental spreading happens when magma rises from the ocean floor causing the old rocks to be pushed away and causing the new rocks to be formed down and to be a replacement for the old rocks that drifted away. This causes a cycle where new rocks and old rocks get replaced and this cycle always has the old rocks getting pushed away.

murzikaleks [220]3 years ago

5 0

Answer:

the different depths of the ocean

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How many grams are needed to prepare 750. mL of a 0.35 M solution of NaOH?

nikdorinn [45]

Answer:

10.5grams

Explanation:

Molarity = number of moles (n)/ volume (V)

According to this question;

Volume = 750 mL = 750/1000 = 0.75L

Molarity = 0.35M

number of moles (n) = molarity × volume

n = 0.35 × 0.75

n = 0.2625mol

Using mole = mass/molar mass

Molar Mass of NaOH = 23 + 16 + 1

= 40g/mol

mole = mass/molar mass

0.2625 = mass/40

mass = 10.5grams

10.5 grams are needed to prepare 0.75L of a 0.35 M solution of NaOH.

3 0

3 years ago

A potassium bromide solution is 8.34% potassium bromide by mass and its density is 1.03 g/ml. what mass of potassium bromide is

jenyasd209 [6]

Answer:- 3.84 grams

Solution:- Volume of the sample is 44.8 mL and the density is 1.03 gram per mL.

From the density and volume we calculate the mass as:

mass = volume*density

$44.8mL(\frac{1.03g}{mL})$

= 46.1 g

From given info, potassium bromide solution is 8.34% potassium bromide by mass. It means if we have 100 grams of the solution then 8.34 grams of potassium bromide is present in. We need to calculate how many grams of potassium bromide are present in 46.1 grams of the solution.

The calculations could easily be done using dimensional analysis as:

$46.1gSolution(\frac{8.34gKBr}{100gSolution})$